Q: If the $$K_{sp}$$ for $$\mathrm{CuBr} is$$ $$6.3 \times 10$$^{-9}$$, what is the molar solubility of $$\mathrm{CuBr}$$ in pure water?

$$7.9 \times 10$$^{-5}$$\ \mathrm{M}$$

Question 1

Which of the following best describes the equilibrium shown in the first image (beakers with solid and ions in solution)?

Accepted Answer

A dynamic equilibrium between a sparingly soluble solid and its dissolved ions.

Question 2

Given the dissolution reaction $$\mathrm{CuBr(s) \rightleftharpoons Cu^+(aq) + Br^-(aq)}$$, what is the correct expression for the solubility product constant ($$K_{sp}$$)?

Accepted Answer

$$K_{sp} = [\mathrm{Cu^+}][\mathrm{Br^-}]$$

Question 3

If the $$K_{sp}$$ for $$\mathrm{CuBr} is$$ $$6.3 	imes 10$$^{-9}$$, what is the molar solubility of $$\mathrm{CuBr}$$ in pure water?

Accepted Answer

$$7.9 	imes 10$$^{-5}$$\ \mathrm{M}$$

Question 4

Which of the following will increase the solubility of $$\mathrm{Zn(OH)_2} in $$water?

Accepted Answer

Adding a strong acid to the solution.

Question 5

Which of the following best describes a Lewis acid in the context of the Lewis acid-base reaction shown in the fifth image (BF$$_3$$ and F$$^-$$)?

Accepted Answer

A species that accepts an electron pair.

Question 6

In the reaction $$\mathrm{BF_3$ + F^- \rightarrow [BF_4$]^-}$$, which species acts as the Lewis base?

Accepted Answer

$$\mathrm{F^-}$$

Question 7

Which of the following statements about the common ion effect is correct?

Accepted Answer

Adding a common ion decreases the solubility of a sparingly soluble salt.

Question 8

A solution contains $$\mathrm{$$BaSO_4$$}$$ and $$\mathrm{Na_2SO_4}. $$What will happen to the solubility of $$\mathrm{$$BaSO_4$$}$$ compared to pure water?

Accepted Answer

The solubility will decrease due to the common ion effect.

Question 9

Which of the following is a correct example of a Lewis acid-base adduct, as shown in the sixth image (Ag$$^+$$ and NH$$_3$$)?

Accepted Answer

$$\mathrm{[Ag(NH_3$)_2]^+}$$

Question 10

If $$Q \u003e K_{sp}$$ for a given ionic compound in solution, what will happen?

Accepted Answer

A precipitate will form until equilibrium is reached.

Question 11

Which of the following best describes the coordinate covalent bond formed in a Lewis acid-base reaction?

Accepted Answer

Both electrons in the bond are donated by the Lewis base.

Question 12

Which of the following compounds will have increased solubility in acidic solution compared to neutral water?

Accepted Answer

$$\mathrm{$$BaF_2$$}$$

Question 13

Which of the following is NOT a Lewis base?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 14

A solution is prepared by mixing $$\mathrm{Sr(NO_3$)_2}$$ and $$\mathrm{K_2CrO_4}. If$$ $$Q \u003c K_{sp}$$ for $$\mathrm{$$SrCrO_4$$}$$, what will happen?

Accepted Answer

No precipitate will form and more $$\mathrm{$$SrCrO_4$$}$$ can dissolve.

Question 15

Which of the following is a correct statement about the solubility product constant ($$K_{sp}$$)?

Accepted Answer

$$K_{sp} is $$temperature dependent.

Question 16

Which of the following is the correct $$K_{sp}$$ expression for $$\mathrm{$$PbBr_2$$(s) \rightleftharpoons Pb$$^{2+}$$(aq) + 2Br^-(aq)}$$?

Accepted Answer

$$K_{sp} = [\mathrm{Pb$$^{2+}$$}][\mathrm{Br^-}]^2$$

Question 17

Which of the following is a real-life application of the common ion effect?

Accepted Answer

Reducing the solubility of calcium salts in hard water by adding sodium carbonate.

Equilibria of Sparingly Soluble Salts and Lewis Acid-Base Chemistry

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