[qwerty]

1)

A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 2.1 × 10-5 M in calcium ion and 4.75 × 10-5 M in oxalate ion. What will happen once these solutions are mixed? Ksp (CaC2O4) = 2.3 × 10-9.

Nothing will happen since both calcium chloride and lithium oxalate are soluble compounds.
A precipitate will form since Q > Ksp for calcium oxalate.
Nothing will happen since Ksp > Q for all possible precipitants.
Nothing will happen since calcium oxalate is extremely soluble.
There is not enough information to determine.

2)

A solution containing AgNO3 is mixed with a solution of NaCl to form a solution that is 0.10 M in AgNO3 and 0.075 M in NaCl. What will happen once these solutions are mixed? Ksp (AgCl) = 1.77 × 10-10.

Nothing will happen since the molar solubility of AgCl is higher than the solution concentrations.

Nothing will happen since NaCl and AgNO3 are both soluble compounds.
Silver chloride will precipitate out of solution, leaving an unsaturated solution of AgCl.
Silver chloride will precipitate out of solution, leaving a saturated AgCl solution.
There is not enough information to say anything about this solution.

3)

Determine the molar solubility of CaSO4 in a solution containing 0.100 M Na2SO4. Ksp (CaSO4) = 2.4 × 10-5.

5.8 × 10-10 M
1.2 × 10-5 M
2.4 × 10-4 M
4.9 × 10-3 M
0.10 M

Thanks !!

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