Question 1

Which of the following best explains why water is an effective solvent for ionic compounds?

Accepted Answer

Water is polar, with the oxygen atom carrying a partial negative charge and the hydrogen atoms carrying partial positive charges, allowing it to surround and stabilize ions.

Question 2

Which of the following substances is a strong electrolyte when dissolved in water?

Accepted Answer

KClO4 (potassium perchlorate)

Question 3

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the concentration of chloride ions in the solution?

Accepted Answer

$$1.0\ \mathrm{M}$$

Question 4

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two solutions are mixed.

Question 5

What is the net ionic equation for the reaction between aqueous solutions of AgNO$$_3$$ and NaCl?

Accepted Answer

$$\mathrm{Ag}^+(aq) + \mathrm{Cl}^-(aq) \rightarrow \mathrm{AgCl}(s)$$

Question 6

Which of the following is a nonelectrolyte in water?

Accepted Answer

CH$$_3CH$_2OH$

Question 7

How many grams of NaCl (molar mass = 58.44 g/mol) are required to prepare 250 mL of a 0.200 M NaCl solution?

Accepted Answer

$$2.92\ \mathrm{g}$$

Question 8

A 10.00-mL sample of vinegar (acetic acid) is titrated with 0.5062 M NaOH. If 16.58 mL of NaOH is required to reach the equivalence point, what is the molarity of acetic acid in the vinegar?

Accepted Answer

$$0.303\ \mathrm{M}$$

Question 9

Which of the following best describes the process of hydration when an ionic compound dissolves in water?

Accepted Answer

Water molecules surround the ions, stabilizing them in solution by ion-dipole interactions.

Question 10

Which of the following is the correct formula for calculating the dilution of a solution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 11

A solution contains 0.65 M $$\mathrm{Ca}_3(\mathrm{PO}_4)_2. $$What is the concentration of $$\mathrm{Ca}^{2+}$$ ions in the solution?

Accepted Answer

$$1.95\ \mathrm{M}$$

Question 12

Which of the following reactions is an example of an oxidation-reduction reaction?

Accepted Answer

$$\mathrm{Ca}(s) + 2\mathrm{H}_2\mathrm{O}(l) \rightarrow \mathrm{Ca(OH)}_2(aq) + \mathrm{H}_2(g)$$

Question 13

What is the mass of AgCl produced when 100.00 mL of 0.350 M AgNO$$_3 is $$mixed with excess NaCl?

Accepted Answer

$$4.20\ \mathrm{g}$$

Question 14

Which of the following statements about strong and weak electrolytes is correct?

Accepted Answer

Strong electrolytes ionize completely in water, while weak electrolytes ionize only partially.

Question 15

A rust stain is removed by washing with 1.0 L of 0.14 M oxalic acid ($$\mathrm{H}_2\mathrm{C}_2\mathrm{O}_4). $$The reaction is: $$\mathrm{Fe}_2\mathrm{O}_3(s) + 6\mathrm{H}_2\mathrm{C}_2\mathrm{O}_4(aq) \rightarrow 2\mathrm{Fe(C}_2\mathrm{O}_4)_3$$^{3-}$$(aq) + 3\mathrm{H}_2\mathrm{O}(l) + 6\mathrm{H}^+(aq). $$What mass of $$\mathrm{Fe}_2\mathrm{O}_3$$ can be removed?

Accepted Answer

$$7.8\ \mathrm{g}$$

Question 16

Which of the following best describes the role of water in dissolving polar covalent compounds like sugar?

Accepted Answer

Water forms intermolecular forces with the polar ends of the sugar, carrying the solute particles away.

Question 17

Which of the following is the correct net ionic equation for the reaction between HBr(aq) and Ca(OH)$$_2(aq$$)?

Accepted Answer

$$2\mathrm{H}^+(aq) + 2\mathrm{OH}^-(aq) \rightarrow 2\mathrm{H}_2\mathrm{O}(l)$$

Question 18

A sample of calcium metal (4.25 g) reacts with water to form Ca(OH)$$_2 in a $$final volume of 225 mL. What is the molarity of hydroxide ions in the solution?

Accepted Answer

$$0.51\ \mathrm{M}$$

Solution Chemistry and Precipitate Reactions: Study Notes

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