I need help with number 5 on the following page: Please show all work! Calculate

Question

I need help with number 5 on the following page:

Please show all work!

Calculate the molar solubility of barium fluoride (ksp = 1.7 x 10-6) 0.0075 M 0.0013 M 0.0098 M 0.0051 M A saturated solution of salt is prepared, The solubility of which of the following salts would not be effected by adjusting the pH of the solution? copper (I) bromide barium carbonate lead (II) sulfide calcium fluoride Calculate the molar solubility of iron (II) carbonate in a 0.024 M solution of sodium carbonate. (ksp = 2.1times10-6) 1.42 times 10-3 M 8.75 times 10-6 M 6.31 times 10-6 M 7.22 times 10-4 M Consider the following reactions Calculate the Ksp value for silver lodide 8.3 times 105 8.3 times 10-7 8.3 times 1025 8.3 times 10-2 How many moles of calcium sulfate can be dissolved in 15 L of water? (Ksp = 2.4 times 10-6) 0.073 mol 0.018 mol 5.4 times 10-3 mol 0.039 mol

Explanation / Answer

5. The answer is: (A) 0.073 mol


CaSO4 <=> Ca2+ + SO42-

[Ca2+] = [SO42-]


Ksp = [Ca2+][SO42-]

= [Ca2+]^2 = 2.4 x 10^(-5)


Molar solubility = [Ca2+] = (2.4 x 10^(-5))^(1/2) = 0.004899 M


Moles of CaSO4 = volume x molar solubility

= 15 x 0.004899

= 0.073 mol

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