Question 1

Which of the following best describes an aqueous solution?

Accepted Answer

A solution in which water is the solvent and a substance is dissolved in it.

Question 2

Which of the following compounds is most likely to be a strong electrolyte when dissolved in water?

Accepted Answer

NaCl (sodium chloride)

Question 3

A chemist wants to prepare 500.0 mL of a 0.100 M Na2SO4 solution. How many grams of Na2SO4 are required? ($$M = \frac{mol}{L}$$, molar mass Na2SO4 = 142 g/mol)

Accepted Answer

$$7.10 g$$

Question 4

Which of the following statements about weak electrolytes is correct?

Accepted Answer

They produce few ions when dissolved in water.

Question 5

What is the concentration of Cl$$^-$$ ions in a 0.40 M solution of MgCl$$_2$$?

Accepted Answer

$$0.80 M$$

Question 6

A student dilutes 250.0 mL of a 2.00 M NaOH solution to a final volume of 1.00 L. What is the final concentration of NaOH? ($$M_1V_1 = M_2V_2)$$

Accepted Answer

$$0.50 M$$

Question 7

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$Ba^{2+} (aq$$) + $$SO_4$$^{2-} (aq) \rightarrow $$BaSO_4 (s$$)$$

Question 8

A solution contains 0.50 mol of Ca(NO$$_3$$)$$_2 in 1.00 L of $$solution. What is the concentration of NO$$_3^-$$ ions?

Accepted Answer

$$1.00 M$$

Question 9

Which of the following is NOT a characteristic of a strong acid in aqueous solution?

Accepted Answer

It is a weak electrolyte.

Question 10

A chemist mixes 100.0 mL of 0.200 M NaOH with 200.0 mL of 0.100 M HCl. What is the concentration of Na$$^+$$ ions in the final solution? (Assume volumes are additive.)

Accepted Answer

$$0.133 M$$

Question 11

Which of the following best explains why sugar (C$$_6H$_{12}O$_6) $$does not conduct electricity when dissolved in water?

Accepted Answer

Sugar molecules do not dissociate into ions in water.

Question 12

What is the molarity of a solution prepared by dissolving 8.00 g of NaOH (molar mass = 40.0 g/mol) in enough water to make 500.0 mL of solution?

Accepted Answer

$$0.40 M$$

Question 13

Which of the following is a precipitation reaction?

Accepted Answer

Mixing aqueous solutions of AgNO$$_3$$ and NaCl to form AgCl(s).

Question 14

A solution is prepared by diluting 50.0 mL of 6.00 M HCl to a final volume of 300.0 mL. What is the final concentration of HCl?

Accepted Answer

$$1.00 M$$

Question 15

Which of the following is the correct formula for calculating the number of moles of solute in a solution?

Accepted Answer

$$mol = M 	imes V$$

Question 16

A solution contains 0.30 M FeCl$$_3. $$What is the concentration of Cl$$^-$$ ions?

Accepted Answer

$$0.90 M$$

Question 17

Which of the following is a correct net ionic equation for the reaction between nickel(II) nitrate and potassium hydroxide?

Accepted Answer

$$Ni^{2+} (aq) + 2OH^- (aq$$) \rightarrow Ni(OH)_2 (s)$$

Question 18

A solution is made by dissolving 0.25 mol of MgCl$$_2 in 1.00 L of $$water. What is the concentration of Mg$$^{2+}$$ and Cl$$^-$$ ions?

Accepted Answer

$$0.25 M Mg$^{2+}$$, $$0.50 M Cl$^-$$

Question 19

Which of the following best describes the process of dilution?

Accepted Answer

Adding more solvent to decrease the concentration.

Aqueous Solutions, Electrolytes, Concentration, and Chemical Reactions: General Chemistry Study Notes

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