Q: A urine sample has a pH of 7.5. What is the $$[\mathrm{H}_3\mathrm{O}^+]$$ concentration?

$$3 \times 10$$^{-8}$$\ \mathrm{M}$$

Question 1

Which of the following best describes an Arrhenius acid?

Accepted Answer

A substance that produces H+ ions when dissolved in water.

Question 2

What is the correct name for H2SO4 according to acid naming conventions?

Accepted Answer

Sulfuric acid

Question 3

Which of the following is the correct balanced equation for the reaction of hydrochloric acid with magnesium metal?

Accepted Answer

$$2\mathrm{HCl}(aq) + \mathrm{Mg}(s) \rightarrow \mathrm{H}_2(g) + \mathrm{MgCl}_2(aq)$$

Question 4

A solution has $$[\mathrm{H}_3\mathrm{O}^+] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is its pH?

Accepted Answer

$$4.00$$

Question 5

Which of the following is a characteristic property of bases?

Accepted Answer

They feel slippery and soapy.

Question 6

What is the correct name for HNO2?

Accepted Answer

Nitrous acid

Question 7

Which of the following is the conjugate base of $$\mathrm{H}_2\mathrm{O} in $$the reaction $$\mathrm{NH}_3 + \mathrm{H}_2\mathrm{O} \rightleftharpoons \mathrm{NH}_4^+ + \mathrm{OH}^-$$?

Accepted Answer

$$\mathrm{OH}^-$$

Question 8

A soft drink contains $$\mathrm{H}_3\mathrm{PO}_4$$ and $$\mathrm{H}_2\mathrm{CO}_3. $$What are the correct names for these acids?

Accepted Answer

Phosphoric acid and carbonic acid

Question 9

Which of the following reactions represents the neutralization of hydrobromic acid with calcium hydroxide?

Accepted Answer

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

Question 10

If a solution has a pH of 9.0 at 25°C, which statement is correct?

Accepted Answer

The solution is basic.

Question 11

Which of the following best describes a Brønsted–Lowry base?

Accepted Answer

A substance that accepts a proton (H+).

Question 12

What is the pOH of a solution with pH = 3.50 at 25°C?

Accepted Answer

$$10.50$$

Question 13

Which of the following is the correct formula for magnesium hydroxide, an ingredient in antacids?

Accepted Answer

$$\mathrm{Mg(OH)}_2$$

Question 14

A urine sample has a pH of 7.5. What is the $$[\mathrm{H}_3\mathrm{O}^+]$$ concentration?

Accepted Answer

$$3 	imes 10$$^{-8}$$\ \mathrm{M}$$

Question 15

Which of the following is a product when an acid reacts with a carbonate?

Accepted Answer

Carbon dioxide gas

Question 16

Which of the following is the correct name for HClO4?

Accepted Answer

Perchloric acid

Question 17

A soil sample is found to be too acidic for crops. Which compound could be added to increase the pH?

Accepted Answer

Calcium carbonate ($$\mathrm{CaCO}_3)$$

Question 18

Which of the following best explains why acids produce a sour taste in fruits?

Accepted Answer

Acids release H+ ions, which interact with taste receptors.

Question 19

Which of the following is the correct balanced equation for the reaction of hydrochloric acid with sodium carbonate?

Accepted Answer

$$2\mathrm{HCl}(aq) + \mathrm{Na}_2\mathrm{CO}_3(aq) \rightarrow \mathrm{CO}_2(g) + \mathrm{H}_2\mathrm{O}(l) + 2\mathrm{NaCl}(aq)$$

chem exam 4 (ch 14)-Acids, Bases, and Their Reactions: Naming, Properties, and the pH Scale

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