Q: If the pH of a solution is 3.5, what is the concentration of H$$^+$$ ions?

$$2.0 \times 10^{-4}\ \mathrm{M}$$

Question 1

Which of the following statements best describes a strong electrolyte in aqueous solution?

Accepted Answer

It completely dissociates into ions in water.

Question 2

Which compound will form a precipitate when mixed with an aqueous solution of AgNO$$_3$$?

Accepted Answer

NaCl

Question 3

What is the net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 4

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

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 5

Which of the following is a nonelectrolyte when dissolved in water?

Accepted Answer

CH$$_3OH$$

Question 6

What is the oxidation number of sulfur in H$$_2SO$_4$$?

Accepted Answer

$$+6$$

Question 7

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 8

If 50.0 mL of 2.0 M HCl is diluted to a final volume of 200.0 mL, what is the final concentration?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 9

Which of the following is the correct balanced molecular equation for the reaction between Pb(NO$$_3$$)$$_2(aq) $$and Na$$_2CO$_3(aq$$)?

Accepted Answer

$$\mathrm{Pb(NO_3)_2(aq) + Na_2CO_3(aq) \rightarrow PbCO_3(s) + 2NaNO_3(aq)}$$

Question 10

Which of the following best describes the role of a base according to the Brønsted-Lowry definition?

Accepted Answer

A substance that accepts a proton (H$$^+).$$

Question 11

A student mixes solutions of Na$$_2SO$_4$$ and Ba(NO$$_3$$)$$_2. $$What is the net ionic equation for the reaction?

Accepted Answer

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

Question 12

Which of the following metals will react with hydrochloric acid to produce hydrogen gas?

Accepted Answer

Magnesium (Mg)

Question 13

What is the pH of a 0.01 M solution of HNO$$_3$$?

Accepted Answer

$$2$$

Question 14

Which of the following is true about oxidation-reduction (redox) reactions?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 15

A titration is performed using 0.100 M NaOH to neutralize 25.0 mL of HCl. If 30.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

Accepted Answer

$$0.0833\ \mathrm{M}$$

Question 16

Which of the following compounds is always soluble in water?

Accepted Answer

NaNO$$_3$$

Question 17

What is the correct order of steps for preparing a solution of known molarity?

Accepted Answer

Weigh solute, add solute to flask, add solvent to mark, mix.

Question 18

Which of the following best describes a metathesis (double-replacement) reaction?

Accepted Answer

A reaction in which ions in two compounds exchange partners.

Question 19

If the pH of a solution is 3.5, what is the concentration of H$$^+$$ ions?

Accepted Answer

$$2.0 	imes 10^{-4}\ \mathrm{M}$$

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