1. What is the molar solubility of calcium sulfate, CaSO 4 in pure water at 25 o
ID: 731270 • Letter: 1
Question
1. What is the molar solubility of calcium sulfate, CaSO4 in pure water at 25 oC? Note that KSP for CaSO4 is x 10 at 25 oC.
IMPORTANT: Express your answer in scientific notation to 2 significant figures. For example, if your answer is 9.8765432 x 10-1, you should enter 9.9E-1.
2. In the previous problem, you calculated the solubility of CaSO4 in mol/L. What is this solubility in g/L.?
Note the following atomic weights: Ca 40.078 S 32.066 O 15.9994
IMPORTANT: Enter your answer in floating point to 2 decimal places. For example, if your answer is 9.876543210, you should enter 9.88.
3. In the previous two problems, you looked at the solubility of CaSO4 in pure water. Now consider a 0.50 M CaCl2 solution. Calcium chloride, CaCl2 is a freely soluble salt. When a 0.50 M CaCl2 solution is prepared, the calcium chloride dissolves without establishing an equilibrium:
CaCl2(s) ==========> Ca2+(aq) + 2Cl-(aq)
In a 0.50 M CaCl2 solution, the concentration of Ca2+ will be 0.50 mol/L. When the CaSO4 is dissolved in this solution, it establishes its usual equilibrium between solid and the ions in solution:
CaSO4(s) <----------> Ca2+(aq) + SO42-(aq)
However, the presence of CaCl2 in this solution means there will be Ca2+ ions in solution even before the CaSO4 dissolves. What is the molar solubility of CaSO4 in a 0.50 M CaCl2 solution?
IMPORTANT: Enter your answer in scientific notation to 2 significant figures. For example, if your answer is 9.8765432 x 10-1, you should enter 9.9E-1.
4 In the previous problem, you calculated the solubility of CaSO4 in a 0.50 M CaCl2 solution in units of mol/L. What is the solubility of CaSO4 in this solution in units of g/L?
IMPORTANT: Enter your answer in scientific notation to 2 significant figures. For example, if your answer is 9.8765432 x 10-1, you should enter 9.9E-1.
Explanation / Answer
what is the Ksp as x 10 is not a valid Ksp also you have asked too many questions in a single post, try putting them in different posts
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