Q: A saturated solution of $$Ca(OH)_2$$ has a pH of 12.40. What is the $$K_{sp} of$$ $$Ca(OH)_2 at $$this temperature?

$$K_{sp} = 5.5 \times 10$$^{-6}$$

Q: Which of the following salts will have the largest molar solubility in water?

$$AgNO_2$$, $$K_{sp} = 6.0 \times 10$$^{-4}$$

Question 1

Which of the following is the correct $$K_{sp}$$ expression for $$Ca_3$$($$PO_4)_2$ dissolving in water?

Accepted Answer

$$K_{sp} = [Ca$$^{2+}$$]^3[PO_4$^{3-}]^2$$

Question 2

A saturated solution of $$Ca(OH)_2$$ has a pH of 12.40. What is the $$K_{sp} of$$ $$Ca(OH)_2 at $$this temperature?

Accepted Answer

$$K_{sp} = 5.5 	imes 10$$^{-6}$$

Question 3

Which of the following will increase the solubility of $$Mg(OH)_2 in $$water?

Accepted Answer

Decreasing the pH of the solution

Question 4

If 0.2 M $$Ba^{2+}$$ and 0.01 M $$F^-$$ are mixed, will $$BaF_2$$ precipitate? ($$K_{sp} = 1.8 	imes 10$$^{-6}$$)

Accepted Answer

Yes, because $$Q \u003e K_{sp}$$

Question 5

Which of the following salts will have the largest molar solubility in water?

Accepted Answer

$$AgNO_2$$, $$K_{sp} = 6.0 	imes 10$$^{-4}$$

Question 6

What is the effect of adding $$CaCl_2 to a $$saturated solution of $$CaF_2$$?

Accepted Answer

The solubility of $$CaF_2$$ decreases due to the common ion effect

Question 7

Which of the following compounds will have increased solubility in acidic solution?

Accepted Answer

$$Mg(OH)_2$$

Question 8

A mixture contains $$[Ba$$^{2+}$$] = 0.010 M $$and $$[Pb$$^{2+}$$] = 0.050 M. If$$ $$Na_2SO_4 is $$added, which ion will precipitate first? ($$K_{sp, $$BaSO_4$$} = 1.1 	imes 10$$^{-10}$$, K$$_{sp, $$PbSO_4$$} = 6.3 	imes $$10^{-7})$$

Accepted Answer

$$Ba^{2+}$$ precipitates first

Question 9

Which of the following best describes the effect of complex ion formation on the solubility of a metal hydroxide?

Accepted Answer

It increases the solubility by removing metal ions from solution as complex ions

Question 10

Calculate the molar solubility of $$Mg(OH)_2 in $$pure water if $$K_{sp} = 1.8 	imes 10$$^{-11}$$.

Accepted Answer

$$1.6 	imes 10$$^{-5}$$ M

Question 11

Which of the following statements about $$K_{sp} is $$correct?

Accepted Answer

$$K_{sp} is $$temperature dependent and does not change with the addition of a common ion

Question 12

A student adds $$NaF to a 1.0 L $$solution of $$0.10 M$$ $$Ca^{2+}$$ until $$CaF_2$$ just begins to precipitate. ($$K_{sp, $$CaF_2$$} = 3.5 	imes 10$$^{-11}$$, MM$$_{NaF} = 42.0$$ g/mol). How many mg of $$NaF$$ must be added?

Accepted Answer

22 mg

Question 13

Which of the following best explains why $$CaCO_3 is $$more soluble in acidic solutions?

Accepted Answer

Acid reacts with $$CO_3$$^{2-}$$ to form CO_2$ and H_2O$, reducing CO_3$^{2-}$$ concentration and shifting equilibrium

Question 14

Which of the following will NOT affect the $$K_{sp} of a $$salt?

Accepted Answer

Adding a common ion

Question 15

A solution contains $$0.10 M$$ $$Mg^{2+}$$ and $$0.05 M$$ $$Al^{3+}$$. $$Na_3PO_4 is $$added slowly. Which ion will precipitate first? ($$K_{sp, Mg_3$(PO_4$)_2} = 1 	imes 10$$^{-25}$$, K$$_{sp, $$AlPO_4$$} = 6 	imes $$10^{-19})$$

Accepted Answer

$$Mg^{2+}$$

Question 16

Which of the following best describes the effect of pH on the solubility of $$PbF_2$$ and $$PbI_2$$?

Accepted Answer

Lowering pH increases the solubility of $$PbF_2$$ but not $$PbI_2$$

Question 17

Which of the following is the correct $$K_{sp}$$ expression for $$Ag_2SO_4$$?

Accepted Answer

$$K_{sp} = [Ag^+]^2[SO_4$^{2-}]$$

Question 18

Which of the following best describes the amphoteric behavior of $$Al(OH)_3$$?

Accepted Answer

$$Al(OH)_3$$ dissolves in both strongly acidic and strongly basic solutions

Question 19

A solution is made by mixing 50 mL of 0.0039 M $$CaCl_2$$ and 75 mL of 0.0077 M $$ZnSO_4. $$Will $$CaSO_4$$ precipitate? ($$K_{sp} = 2.4 	imes 10$$^{-5}$$)

Accepted Answer

Yes, because $$Q \u003e K_{sp}$$

Solubility Equilibria: Ksp, Precipitation, and Factors Affecting Solubility

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