strontium phosphate ksp

17.2: Molar Solubility and Ksp Last updated; Save as PDF Page ID 55076; Relating Solubilities to Solubility Constants; The Common Ion Effect; Relating Solubilities to Solubility Constants . Problem: Write the K sp expression for the following weak electrolytes: Mn(OH) 3 (s), Sr 3 (AsO 4) 2 (s), and Co 2 S 3 (s). What is the molar solubility of Sr3 (PO4)2 a) in pure water? If a compound in the mixture contains sulfide, hydroxide, carbonate, or phosphate, it is generally insoluble. Recall pure solids (and pure liquids) are not included in an equilibrium constant expression. What is the Ksp expression in terms of… American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British … Memorize the rules or …. Put these values into the solubility product expression, and do the sum. Strontium carbonate SrCO 3 1.1×10 –10 Strontium chromate SrCrO 4 2.2×10 –5 Strontium fluoride SrF 2 2.5×10 –9 Strontium sulfate SrSO 4 3.2×10 –7 Thallium(I) bromide TlBr 3.4×10 –6 Thallium(I) chloride TlCl 1.7×10 –4 TlI –8 It is poorly soluble in water to the extent of 1 part in 8,800. 3rd: Use reaction stoichiometry to determine mol Ca+2 and mol F-: Because there is exactly 1 L of solution, these values are also the molarities of each ion. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> endobj Strontium phosphate 7446-28-8 Strontium orthophosphate UNII-B7CF3BD0TT Phosphoric acid, strontium salt (2:3) Phosphoric acid, strontium salt tristrontium;diphosphate B7CF3BD0TT 14414-90-5 Strontium phosphate, tribasic The formula indicates that a single molecule of strontium phosphate contains three atoms of strontium, symbolized by Sr, two atoms of phosphorus, represented by P, and eight atoms of oxygen, indicated by the elemental symbol O. 1.00 liter of saturated BaSO4 solution will contain only ~0.0025 gram of dissolved BaSO4. The solubility (by which we usually mean the molar solubility) of a solid is expressed as the concentration of the "dissolved solid" in a saturated solution. When a reasonable quantity of solid BaSO4 is mixed with water, only a very small amount will dissolve to produce Ba+2 (aq) and SO4–2(aq). calculate the solubility of ag2co3 in water at 25°c. Strontium phosphate, Sr3 (PO4)2Sr3​ (PO4​)2​, dissociates when placed in water. • Strong bases Calculating Solubility from K sp: Example: One liter of saturated calcium fluoride solution contains 0.0167 gram of CaF 2 at 25 o C. Calculate K sp for CaF 2. Solve the equation exactly. Strontium sulfate (SrSO 4) is the sulfate salt of strontium.It is a white crystalline powder and occurs in nature as the mineral celestine.It is poorly soluble in water to the extent of 1 part in 8,800. Sodium Phosphate (88g / Liter) Na 3 PO 4 2.24 Sodium Sulfate (195g / Liter) Na 2 SO 4 10.3 Sodium Sulfide (154g / Liter) Na 2 S 30.7 Strontium Carbonate (.01g / Liter) SrCO 3 4.59 x 10-9 Strontium Chloride (538g / Liter) SrCl 2 Strontium Phosphate. 0 0. Phosphides react quickly upon contact with moisture or acids to give the very toxic gas phosphine ; phosphides also can react vigorously with oxidizing materials. A small value of K sp indicates a insoluble substance. 1 x 10^-31 = ( 3x)^3 (2x)^2= 108 x ^ 5. x = 2.47 x 10^-7 M. Moles per liter of Sr3(PO4)3 that dissolve = 2.47 x10^-7. The K sp values are indicators of the solubility of compounds. Calculate the Ksp of Sr3 (PO4)2Sr3​ (PO4​)2​. Kp (SrSO4) = 2.5 ×… Solve the equation exactly. A) 9.0 x 10-9; B) 8.1 x 10-5; C) 3.8 x 10-6; D) 8.1 x 10-7; E) 4.6 x 10-7. In general, M a X b (s) <=> aM +b (aq) + bX -a (aq) is expressed as Ksp = [M +b] a [X −a] b These expressions are called solubility product constant expressions because they involve the product of the equilibrium concentrations of the constituent ions, each raised to the power corresponding to the number of ions in the formula. • Water. Octacalcium phosphate in dilute solutions exchanges a few percent of calcium against strontium. Strontium phosphate can be formed through a reaction of Sr (OH)2 and … zirconium (+4) phosphate (4:3) zirconium phosphate. <> (Ksp = 2.1 x 10-33) 10. %���� Strontium phosphate, Sr3 (PO4)2 has a Ksp = 1.0×10-31 at 298K. The compound has a molar mass of 452.80 grams per mole and has the appearance of a white powder. a. endobj What will be the equilibrium concentrations of calcium and phosphate ions in a saturated solution of calcium phosphate? Call Direct: 1 (866) 811-5546 Sign In Start Free Trial. KSP = 8.1 x 10-9 for BaCO3. For a reaction between sodium phosphate and strontium nitrate write out the following: a) The balanced molecular equation b) The ionic equation c) The net ionic equation a) I think I have this one: 2 Na3PO4 (aq) + 3 Sr(NO3)2 (aq) --> 6 NaNO3 (aq) + Chem 2. what is the solubility of silver carbonate in water in 25 degrees celcius if Ksp=8.4X10-12? It is a white crystalline powder and occurs in nature as the mineral celestine. Solution for Calculate the solubility of strontium sulfate, SRSO4, in 6.05 × 10-² M of sodium sulfate, Na, SO4. Posted on 13th February 2021 by . Still have questions? • Strong acids I�Y��~�����E �f�.�8zW�NǙu���P�}_/���\�q�:'�����}dN�Þ�_�IB�*�rd�h������A���û�q����3��+��Ѐ���Z Free samples program. We dissolve 0.005 mole of strontium chromate in 1 L of solution at 25 C. Will a precipitate be 3 0 obj Silver(I) phosphate Ag 3 PO 4 8.89 ⋅ 10–17 Silver(I) sulfate Ag 2 SO 4 1.20 ⋅ 10–5 Silver(I) sulfite Ag 2 SO 3 1.50 ⋅ 10–14 Silver(I) thiocyanate AgSCN 1.03 ⋅ 10–12 Strontium arsenate Sr 3 (AsO 4) 2 4.29 ⋅ 10–19 3 5.60 ⋅ 10–10 2 3) Calculate the molar solubility of strontium phosphate, Sr3(PO4)2, in pure water and the concentration of strontium and phosphate ions in saturated strontium phosphate at 25oC. The substances are listed in alphabetical order. <> 2. Calculate Ksp for, AgCl. ���˿.���D��1�7Ȓ��˦����� E'�z��n6{��� �gB��$�d�D�_3���T��k1����ѫN‐C�*@{� ��\0Ip[�o3��=dɅ��D�!�4��&�up���@ǫz1�'��7�����R��Z&p�t�tҙ�����$5��*�N��'b� ������һ�?����&� ��[�Љʷ�%�(3x2���goVN0XENg��0F�[��>���_���r���&��}�q0��q�~�oV�jx�� zirconyl phosphate gel. Calculate Ksp for CaF2. Ksp = [Sr2+]^3 [ PO43-] ^2 let x = moles/L Sr3(PO4)2 that dissolve . Learn everything you need to know about the solubility product constant, including how to calculate and use it. Source(s): https://shrink.im/a9J29. Pierce, and Charlotte N. Kajdi From the Departments of Pediatrics, Johns Hopkins University, Baltimore, and New York University College of Medicine, New York City Received June 28, 1954 INTRODUCTION The conditions controlling … <>/Metadata 989 0 R/ViewerPreferences 990 0 R>> Strontium Phosphate is generally immediately available in most volumes. strontium phosphate, which dissociates according to the equation: CuC 4 H 4 O 6 2+ (s) Cu (aq) + C 4 H 4 O 6 2− (aq) Sr 3 (PO 4) 2 (s) 3Sr2+ (aq) + 2PO 43− (aq) And, the solubility product expressions are: For copper (II K Strontium chromate is highly corrosive and is a strong oxidizing agent. • Water insoluble salts (actually they have very, very low solubility in water and therefore are also called slightly soluble salts) Lv 4. The table below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure.Units of solubility are given in grams per 100 millilitres of water (g/100 mL), unless shown otherwise. It is more soluble in dilute HCl and nitric acid and appreciably soluble in alkali chloride solutions (e.g. They slowly generate flammable or noxious gases in contact with water . 2) Calculate the molar solubility of barium sulfate, BaSO4, in pure water and the concentration of barium and sulfate ions in saturated barium sulfate at 25oC. Strontium sulfate (SrSO 4) is the sulfate salt of strontium. Because of its low charge density, the phosphate ion would be expected to be more soluble than the carbonate ion. Molecular weight calculation: 87.62*3 + 30.973761*2 ›› Percent composition by element. A saturated solution of copper (II) tartrate can be prepared by mixing solutions of copper (II) sulfate and sodium tartrate. Entre le solide et sa solution saturée s'établit un équilibre de dissolution. A predictive equation for the solubility of strontium sulfate is presented, which is useful for calculating solubility in water containing 0 to 200 g/L (0 to 200 g/dm3) sodium chloride at temperatures from 100 to 300 degrees F (38 to STRONTIUM PHOSPHIDE is a reducing agent. 2. This is “Appendix B: Solubility-Product Constants (Ksp) for Compounds at 25°C”, appendix 2 from the book Principles of General Chemistry (v. 1.0). The KSP Of Sr3(PO4)2 = 1.0x10-31 . Compound. 2. silver bromide Dissociation equation: _____ Ksp expression: Ksp value: Molar solubility of salt: 3. strontium phosphate Dissociation equation: Ksp expression: 4. sodium chloride). Strontium Phosphate Zn(BrO3)2 Tin (IV) Nitrite AgNO3 Iron (III) Thiosulfate Au3PO3 Lead (IV) Sulfide KCNO Calcium Nitride FeS Sodium Sulfate FeSO3 Aluminum Hydroxide Ga(IO)3 Nickel (III) Permanganate Hg2SO4 Cuprous Chloride CuCl Gallium Hypoiodite Al(OH)3 Sr3(PO4)2 is mainly used in electrical and medical industries. Ksp is constant at a given temperature (van’t Hoff equation) for a saturated solution of a given compound. Whereas solubility is usually expressed in terms of mass of … Strong electrolytes include: Home / Uncategorized / calculate the solubility of ag2co3 in water at 25°c. It is more soluble in dilute HCl and nitric acid and appreciably soluble in alkali chloride solutions (e.g. Solution for The Ksp of strontium phosphate Sr₃(PO₄)₂ is 1.2× 10⁻³¹. Thus the solubility product constant is represented by the expression: Ksp = [Cu2+] [C2H2062-] The copper 2+ ion has a characteristic blue color. 4 Part III: Design a Salt Click on the Design a Salt tab at the top of the sim. Confused about Ksp chemistry equations? For details on it (including licensing), click here. Formula. Ksp = [Sr2+]^3 [ PO43-] ^2. In a saturated aqueous solution of SrF2, the strontium ion concentration is 0.000855 M and the fluoride ion concentration is 0.00171 M. I tried plugging the given molarities in Ksp=[Sr^2+][F^-]^2 , but the website says I have the wrong answer. Write and Equilibrium Constant Expression for a Slightly Soluble Salt: The expression is called the Solubility Product Constant (Ksp), Example: BaSO4 is a slightly soluble salt. Silver(I) phosphate Ag 3 PO 4 8.89 × 10 −17 Silver(I) sulfate Ag 2 SO 4 1.20 × 10 −5 Silver(I) sulfide Ag 2 S 6.3 × 10 −50 Silver(I) sulfite Ag 2 SO 3 1.50 × 10 −14 Silver(I) thiocyanate AgSCN 1.03 × 10 −12 Strontium arsenate Sr 3 3) Calculate the molar solubility of strontium phosphate, Sr3(PO4)2, in pure water and the concentration of strontium and phosphate ions in saturated strontium phosphate at 25oC. Silver(I) phosphate Ag 3 PO 4 8.89 x 10-17 Silver(I) sulfate Ag 2 SO 4 1.20 x 10-5 Silver(I) sulfite Ag 2 SO 3 1.50 x 10-14 Silver(I) sulfide Ag 2 S 8 x 10-51 Silver(I) thiocyanate AgSCN 1.03 x 10-12 Strontium arsenate Sr 3 (AsO 4) 2 A saturated solution of copper (II) tartrate can be prepared by mixing solutions Kp (SrSO4) = 2.5 ×… La solubilité est la quantité maximale de produit que l'on peut dissoudre à une température déterminée dans une quantité de solvant déterminée. In the present study we investigated the capacity of Sr-substituted sol–gel calcium phosphate to modify the expression of genes and proteins involved in extracellular matrix synthesis by primary bone cells. The Ksp of calcium carbonate is 4.5 × 10 -9. What will be the equilibrium concentrations of lead and fluoride ions in a saturated solution of plumbous fluoride? In this laboratory you will determine the K sp for the slightly soluble salt, copper (II) tartrate, and strontium phosphate, which dissociates according to the equation: CuC 4 H 4 O 6 (s) → Cu 2+ (aq) + C 4 H 4 O 6 2− (aq) Sr 3 4) It is soluble in water. These expressions are called solubility product constant expressions because they involve the product of the equilibrium concentrations of the constituent ions, each raised to the power corresponding to the number of ions in the formula. Molar Mass: 452.8027. 4 years ago . This general chemistry video tutorial focuses on Ksp – the solubility product constant. This substance is used as a colorant in polyvinyl chloride, in pyrotechnics, in chrome plating, in aluminum flake coatings, and as a corrosion inhibitor and metal conditioner. Strontium Phosphate Sr3(PO4)2 bulk & research qty manufacturer. zirconium phosphate, 32P-labeled cpd. Ksp = [Ca2+][F-]2 = [2.14x10-4][4.28x10-4]2 = 3.9 x 10-11. (Ksp) Ksp = [M+] [ A−] The Ksp for a slightly soluble salt is determined by measuring the concentrations of the M+ and A− ions in a saturated solution. Term contracts & credit cards/PayPal accepted. stream let x = moles/L Sr3(PO4)2 that dissolve . The KSP Of Sr3(PO4)2 = 1.0x10-31 . Ksp is constant at a given temperature (van’t Hoff equation) for a saturated solution of a given compound. 1. i���ZN�-Jx�e����r� .�_���>z T����}r;\�8��S�~�-��L*��t=�i����,�m��n�8�uԬw�n��f���:9[.����({lY-�V�,v��ߡ�M-��d���:no��W�6[�4�V+����rED���\ܺ���_�T\�������67%.�l��e�֖�U�Ժ��y\-ʑ�fT͗�f1^+Q�� ���5�����ƛ. Sr3 Po4 2. • Most water soluble salts, Weak electrolytes include: calculate the solubility of ag2co3 in water at 25°c Home; About; Contacts Question: Calculate The Concentration Of Sr2+ Ions And PO4 3- Ions In A Saturated Solution Of Strontium Phosphate. The chemical formula for strontium phosphate is Sr3(PO4)2. 1. x��][s��~����V��W �$3���n�4��ۓ�x�0% �������ˮD�:�X�{�����ժ.��Q}��ի���&����uU������������m��e��z����яUUOV�]�y}~�"MR�+����¿Y!������-^��~���Տ""Iu�~��vi$"�tb�(����f���.�n��gtK����_^��������^��z���ς�i"v� ���N�y�`2��RG&M��g4�?����_qe~��M���\2��1fi���lA�M�G�~w\X:� Please write your answer using scientific notation according to the following format: 0.0010 would be writen as 1.0*10^-3. Reference: Lange's Handbook, pps. by 17 February 2021 17 February 2021 Ksp (A a B b) = [A +] a ∙ [B -] b. 13 13. Ksp = 1.0 x (10)^-31 so [Sr2+]^3 [ (PO4)-2]^2 = … Element : Symbol : Atomic Mass # of Atoms : Mass Percent: Strontium: Sr: 87.62: 3: 80.928%: Phosphorus: P: 30.973761: 2: 19.072% ›› Calculate the molecular weight of a chemical compound. At what molarity of SrCl₂ will you just start to precipitate the phosphate from a solution that has a phosphate concentration of Q: Using the reaction enthalpy data Ksp Chemistry: Complete Guide to the Solubility Constant. Silver phosphate Ag 3 PO 4 8.89x10-17 Silver bromide AgBr 5.35x10-13 Silver bromate AgBrO 3 5.38x10-05 Silver acetate AgCH 3 COO 1.94x10-03 Silver chloride AgCl 1.77x10-10 Silver cyanide AgCN 5.97x10-17 Silver iodide AgI Strontium Chromate is a yellowish, crystalline, inorganic compound that emits toxic chromium fumes upon heating. (Ksp = 3.3 x 10-8) 11. Problem: Write the Ksp expression for the following weak electrolytes: Mn(OH)3(s), Sr3(AsO4)2(s), and Co2S3(s). 8-6 to 8-11; L.G. Ksp of strontium phosphate Sr₃(PO₄)₂ is 1.2× 10⁻³¹. ��"����x� %{ If the solubility of strontium carbonate is s mol dm-3, then [Sr2+] = s mol dm-3 [CO 3 2-] = s mol dm-3 K sp = [Sr2+] [CO 3 2 -] = s2 = 1.10 x 10-10 mol2 dm-6 s = 1.05 x 10-5 mol dm-3 www.chemguide.co.uk Ag+ (aq) + Cl-AgCl (s) (aq) Sr2+ (aq) + 2OH-Sr(OH) 2(s) (aq) Sr2+ (aq) + CO 3 2-SrCO 3(s) (aq) C he m g ui d e – an s we r s 4. By Sillen and A.E. Posted by Melody Douglas | Sep 30, 2017 3:18:00 PM. Aluminum phosphate AlPO 4 9.84 ⋅ 10–21 Barium bromate Ba(BrO 3) 2 2.43 ⋅ 10–4 Barium carbonate BaCO 3 2.58 ⋅ 10–9 Barium chromate BaCrO 4 1.17 ⋅ 10–10 Barium fluoride BaF 2 1.84 ⋅ 10–7 Barium hydroxide octahydrate Ba(OH) 2 ⋅ 8H 2 O 2.55 ⋅ 10–4 Barium iodate Ba(IO 3) 2 4.01 ⋅ 10–9 Barium iodate monohydrate Ba(IO 3) 2 ⋅ H 2 O 1.67 ⋅ 10–9 Barium molybdate BaMoO Contents THE SOLUBILITY OF THE PHOSPHATES OF STRONTIUM, BARIUM, AND MAGNESIUM AND THEIR RELATION TO THE PROBLEM OF CALCIFICATION1 L. Emmett Holt, Jr., Jerry A. Hi, you can try to look at the PHREEQC database, it contains many Ksp for many products. endobj 1 0 obj For every mole of calcium phosphate which dissolves, you will get 3 moles of Ca2+ ions and 2 moles of PO 4 3-ions.If the solubility of calcium phosphate is s mol dm-3, then [Ca2+] = 3s mol dm-3 SAT / ACT Prep Online Guides and Tips. • Weak bases Strontium sulfite 13451-02-0 Sulfurous acid, strontium salt (1:1) Sulfurousacid, strontium salt (1:1) Strontiumsulfit strontium;sulfite SO3.Sr Sulfurous acid strontium salt CTK4B9220 DTXSID20884607 8924AF how to calculate solubility from ksp Formula: Sr3(PO4)2. Ksp= 1.0 x 10- 31. Fe(OH)2; Ksp = 8 x 10-16 c. Mg3(AsO4)2; Ksp = 2 x 10-20 View Answer A combination of 0.010 moles of plumbous ions and 0.0010 moles of iodide ions in 1.0 L of solution forms a/an because. This compound has a solubility of 0.112 mg/L in water at 20 °C. Calculate the solubility of Sr3(PO4)2. Ksp (AgCl) = 1.7 x 10-10 12 12.7.8 g of calcium fluoride is dissolved in 100 L of water at 25 C. Will a precipitate be formed? A salt can be either a strong electrolyte or a weak electrolyte. Thus the solubility product constant is represented by the expression: Ksp = [Cu2+] [C2H2062-] The copper 2+ ion has a characteristic blue color. calculate the solubility of ag2co3 in water at 25°c. Structure. Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate.Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids. See more Strontium products. In this experiment, we can measure the concentration of the anion because it is a weak acid which can be titrated with a strong base. Salt: An ionic compound which consists of a cation other than H+ and anion other than OH-. The value of the solubility constant depends only on temperature for a given salt. Calcium phosphates are widely used as biomaterials and strontium (Sr) is known to have the ability to modify the bone balance towards osteosynthesis. T - F . zirconium phosphate, monohydrate (2:1) zirconium phosphate, sodium salt (2:1:1) zirconium phosphate, sodium salt (2:2:1) zirconium phosphate, sodium salt (3:1:2) zirconyl phosphate. By means of titration curves of phosphoric acid with alkaline earth bases, the solubility of the orthophosphates of magnesium, strontium, and barium has been studied and related to that of the corresponding calcium salts. Ksp… Miscellaneous . Sr3 (PO4)2 (s)←→3Sr2+ (aq) + 2 (PO4)3- (aq) So 0.896 moles per liter of the strontium phosphate. Solution for Given: Calculate the solubility of strontium sulfate (Ksp = 2.8 × 10–7) in a 0.10 M solution of Na2SO4. Example: One liter of saturated calcium fluoride solution contains 0.0167 gram of CaF, 1) One liter of saturated silver chloride solution contains 0.00192 g of dissolved AgCl at 25, 2) Calculate the molar solubility of barium sulfate, BaSO, , in pure water and the concentration of barium and sulfate ions in saturated barium sulfate at 25, 3) Calculate the molar solubility of strontium phosphate, Sr, , in pure water and the concentration of strontium and phosphate ions in saturated strontium phosphate at 25. Strontium phosphate is also known as tristrontium diphosphate, strontium orthophosphate, strontium phosphatetribasic, strontium salt and tristrontium bis (orthophosphate). Practice Problems Answers: 1) One liter of saturated silver chloride solution contains 0.00192 g of dissolved AgCl at 25oC. 2) Calculate the molar solubility of barium sulfate, BaSO4, in pure water and the concentration of barium and sulfate ions in saturated barium sulfate at 25oC. Properties, SDS, Applications, Price. At what molarity of SrCl₂ will you just start to precipitate the phosphate from a solution… 8.1 x 10-9 = [Ba2+][CO3-2] = [0.010 M + x][ x] ~ [0.010 M][ x] ( x = MS = 8.1 x 10-7 M. 7. The Equilibrium constant expression for this reaction can be written as:  Ksp = [BaBa+2][SO4–2]. • Weak acids Ksp … Convert grams Strontium Phosphide to moles or moles Strontium Phosphide to grams. The equilibrium constant for a dissolution reaction, called the solubility product (Ksp), is a measure of the solubility of a compound. 2 0 obj 1st: Write the balanced equation for the salt dissolving in water: CaF2(s) ó Ca+2(aq) + 2F–(aq). Sr3(PO4)2 is a white powder at room temperature. Example: One liter of saturated calcium fluoride solution contains 0.0167 gram of CaF2 at 25oC. sodium chloride). 0 0. treaster. How do you know if a salt is soluble in water or not? Calculate Ksp for, AgCl. High purity, submicron and nanopowder forms may be considered. Answer to Strontium phosphate (Sr3(PO4)2) has a Ksp = 1*10^-31. This will give 3x moles/L Sr2+ and 2x moles/L PO43-Substituting these values . 4 0 obj 1) One liter of saturated silver chloride solution contains 0.00192 g of dissolved AgCl at 25oC. ›› Strontium Phosphide molecular weight Molar mass of Sr3P2 = 324.807522 g/mol Convert grams Strontium Phosphide to moles or moles Strontium Phosphide to grams Molecular weight calculation: 87.62*3 + 30.973761*2 ›› Le produit de solubilité (K ps ) est le produit des … %PDF-1.7 In general, MaXb(s) <=> aM+b(aq) + bX-a(aq)  is expressed as  Ksp = [M+b]a[X−a]b. C he m g ui d e – an s we r s 4. Which was Ksp= 3 x 10^-9. This problem has been solved!

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