Q: A student titrates 0.0150 L of acetic acid with 20.0 mL of 0.300 M NaOH. What is the molarity of the acetic acid solution? (Assume 1:1 stoichiometry)

$$\mathrm{M = \frac{(0.0200\,L) \times 0.300\,mol/L}{0.0150\,L} = 0.400\,M}$$

Q: If 25.5 mL of 0.438 M NaOH is required to neutralize 0.0250 L of HCl, what is the molarity of the HCl solution?

$$\mathrm{M = \frac{(0.0255\,L) \times 0.438\,mol/L}{0.0250\,L} = 0.447\,M}$$

Question 1

Which of the following best describes the reaction that occurs when hydrochloric acid (HCl) is added to magnesium metal (Mg)?

Accepted Answer

A single displacement reaction producing magnesium chloride and hydrogen gas: $$\mathrm{Mg(s) + 2HCl(aq) \rightarrow $$MgCl_2$$(aq) + H_2$(g)}$$

Question 2

Which equation correctly represents the reaction between sodium bicarbonate (NaHCO$$_3) $$and hydrochloric acid (HCl)?

Accepted Answer

$$\mathrm{$$NaHCO_3$$(aq) + HCl(aq) \rightarrow NaCl(aq) + CO_2$(g) + H_2O(l)}$$

Question 3

A student titrates 0.0150 L of acetic acid with 20.0 mL of 0.300 M NaOH. What is the molarity of the acetic acid solution? (Assume 1:1 stoichiometry)

Accepted Answer

$$\mathrm{M = \frac{(0.0200\,L) 	imes 0.300\,mol/L}{0.0150\,L} = 0.400\,M}$$

Question 4

Which of the following is a correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Question 5

Which compound is commonly used in antacids to neutralize excess stomach acid, and what is the reaction with HCl?

Accepted Answer

Calcium carbonate; $$\mathrm{$$CaCO_3$$(s) + 2HCl(aq) \rightarrow $$CaCl_2$$(aq) + CO_2$(g) + H_2O(l)}$$

Question 6

During a titration, the endpoint is reached when:

Accepted Answer

The moles of acid equal the moles of base added.

Question 7

Which of the following equations represents the reaction of aluminum metal with nitric acid?

Accepted Answer

$$\mathrm{2Al(s) + 6HNO_3(aq) \rightarrow 2Al(NO_3$)_3(aq) + 3H_2(g)}$$

Question 8

A neutralization reaction between barium hydroxide and phosphoric acid produces which salt and how many water molecules?

Accepted Answer

$$\mathrm{Ba_3$(PO_4$)_2}$$ and $$6$$ water molecules: $$\mathrm{3Ba(OH)_2(aq) + 2H_3PO_4(aq) \rightarrow Ba_3$(PO_4$)_2(s) + 6H_2O(l)}$$

Question 9

Which of the following is NOT a product when hydrochloric acid reacts with calcium carbonate?

Accepted Answer

Hydrogen gas

Question 10

If 25.5 mL of 0.438 M NaOH is required to neutralize 0.0250 L of HCl, what is the molarity of the HCl solution?

Accepted Answer

$$\mathrm{M = \frac{(0.0255\,L) 	imes 0.438\,mol/L}{0.0250\,L} = 0.447\,M}$$

Question 11

Which of the following statements about antacids is TRUE?

Accepted Answer

Antacids neutralize excess stomach acid by reacting with HCl to produce water and a salt.

Question 12

Which of the following is the correct balanced equation for the neutralization of magnesium hydroxide with nitric acid?

Accepted Answer

$$\mathrm{Mg(OH)_2(s) + 2HNO_3(aq) \rightarrow Mg(NO_3$)_2(aq) + 2H_2O(l)}$$

Question 13

Which of the following is a real-life application of acid-base neutralization?

Accepted Answer

Using antacids to relieve heartburn by neutralizing stomach acid.

Question 14

What is the role of phenolphthalein in an acid-base titration?

Accepted Answer

It acts as an indicator, turning pink at the endpoint when the solution is neutralized.

Question 15

Which of the following is NOT a basic compound found in common antacid tablets?

Accepted Answer

Sodium chloride (NaCl)

Question 16

Which of the following reactions produces carbon dioxide gas?

Accepted Answer

$$\mathrm{HCl(aq) + $$NaHCO_3$$(aq) \rightarrow NaCl(aq) + CO_2$(g) + H_2O(l)}$$

Question 17

Which of the following is the correct group of coefficients for the neutralization reaction: $$\mathrm{3HCl(aq) + Al(OH)_3(aq) \rightarrow $$AlCl_3$$(aq) + 3H_2O(l)}$$?

Accepted Answer

3, 1, 1, 3

Acids, Bases, and Equilibrium: Reactions and Titrations

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