Q: What is the correct formula to calculate the molarity (M) of a solution?

$$\mathrm{M = \frac{\text{moles\ solute}}{\text{volume\ of\ solution\ (L)}}}$$

Question 1

Which of the following best explains why a sodium chloride solution conducts electricity, but a sucrose solution does not?

Accepted Answer

Sodium chloride forms ions in solution, while sucrose remains as intact molecules.

Question 2

What is the net ionic equation for the reaction between aqueous solutions of Pb(NO$$_3$$)$$_2$$ and KI?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$ (aq) + 2I^- (aq) \rightarrow $$PbI_2$$ (s)}$$

Question 3

Which of the following compounds is expected to be insoluble in water according to the solubility guidelines?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 4

A solution is prepared by dissolving 21.0 g of NaF in enough water to make 500. mL of solution. What is the molarity of the solution? (Molar mass of NaF = 42.0 g/mol)

Accepted Answer

$$\mathrm{1.00\ M}$$

Question 5

Which of the following best describes the role of water molecules when an ionic compound dissolves in water?

Accepted Answer

Water molecules surround and stabilize the ions, preventing them from recombining.

Question 6

How many moles of solute are present in 2.00 L of a 0.200 M solution of HNO$$_3$$?

Accepted Answer

$$\mathrm{0.400\ mol}$$

Question 7

Which of the following statements about electrolytes is correct?

Accepted Answer

Nonelectrolytes do not conduct electricity because they do not form ions in solution.

Question 8

A laboratory technician needs to prepare 250. mL of 0.10 M K$$_2Cr$_2O$_7$$ solution from a 5.0 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$\mathrm{25.\ mL}$$

Question 9

Which of the following best explains why the solubility of most solid solutes increases with temperature?

Accepted Answer

Higher temperatures increase the kinetic energy of the solute and solvent particles, allowing more solute to dissolve.

Question 10

Which of the following is a spectator ion in the reaction: Na$$_2CO$_3(aq) + 2 $$AgNO$$_3(aq$$) $$\rightarrow 2 $$NaNO$$_3(aq) + Ag$_2CO$_3(s$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 11

A solution is made by dissolving 5.00 g of glucose (C$$_6H$_{12}O$_6) in 100. mL of $$water. What is the percent weight/volume (% w/v) of glucose in the solution?

Accepted Answer

$$\mathrm{5.00\%}$$

Question 12

Which of the following best describes a nonelectrolyte?

Accepted Answer

A substance that does not form ions in solution and does not conduct electricity.

Question 13

Which of the following compounds will form a precipitate when mixed with a solution of Na$$_2CO$_3$$?

Accepted Answer

$$\mathrm{$$AgNO_3$$}$$

Question 14

What is the correct formula to calculate the molarity (M) of a solution?

Accepted Answer

$$\mathrm{M = \frac{	ext{moles\ solute}}{	ext{volume\ of\ solution\ (L)}}}$$

Question 15

Which of the following best describes the process of dilution?

Accepted Answer

Adding solvent to a solution to decrease its concentration.

Question 16

Which of the following is the correct balanced net ionic equation for the reaction between FeSO$$_4(aq) $$and Pb(NO$$_3$$)$$_2(aq$$)?

Accepted Answer

$$\mathrm{SO_4$^{2-} (aq) + Pb$$^{2+}$$ (aq) \rightarrow $$PbSO_4$$ (s)}$$

Question 17

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

Accepted Answer

Water is a polar molecule that can surround and stabilize ions.

Solutions: Properties, Electrolytes, Solubility, and Concentration

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