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Review Questions Chapter 12

1 Which of the following statements are true of an acid?

1. Its aqueous solution contains more hydroxide than hydrogen ions.
2. Its aqueous solution turns litmus blue.
3. It is a proton acceptor.
4. It is more apt to contain a metal than a nonmetal.
none
all
1, 2, and 3
2, 3, and 4
1 and 3

2. Which of the following can act as Brønsted-Lowry bases?

none
all
1,2, and 3
2, 3, and 4
1 and 3

3. Which of the following formulas has been given an incorrect name? All are names as if in aqueous solution

HBr, hydrobromic acid
H2SO3, sulfurous acid
HNO3, nitrous acid
Cu(CHO2)2, copper(II) formate
H3PO4, phosphoric acid

4. Which of the following statements is not true of a weak acid?

Its solution contains fewer ions than molecules of the acid.
Its formula always shows two oxygen atoms.
Its solution contains a dynamic equilibrium.
The value of its equilibrium constant is less than 1.0
All of these statements are true of a weak acid.

5. What is the molarity of a solution of hydrochloric acid that was prepared by diluting 5.0 mL of 12 M HCl to 100 mL?

0.50 M
0.12 M
0.60 M
1.2 M
6.0 M

6. Which of the following statements are true of pH?

1. it is always less than 7 in the solution of an acid.
2. The pH of 0.1 M HCl is 1.
The pH of a 0.1 M solution of a weak acid is always less than 7 but more than 1.
none
all
1 and 2
2 and 3
1 and 3

7. The addition of solid sodium nitrite to a solution of nitrous acid will?

not change the pH of the solution.
lower the pH of the solution.
raise the pH of the solution.
increase the concentration of hydrogen ions in the solution
lower the concentration of the NO2- ion.

8. Which of the following solutions contains the smallest number of hydrogen ions?

1.0 L of 0.1 M HNO3.
1.0 L of 0.1 M H2SO4.
1.0 L of 0.1 M HC2H3O2.
1.0 L of 0.1 M HCl.
They all contain the same concentration of hydrogen ions.

9. Magnesium metal is added in exces to 50 mL of the solutions. From which would 0.10 g hydrogen be produced?

0.05 M H2SO4
0.10 M HCl
0.01 M HC2H3O2
from none of them
from all of them

10. What is the concentration of hydroxide ion in 0.010 M HCl?

0.010 M
1.0x10-9 M
1.0x10-7 M
1.0x10-12
The hydroxide ion concentration cannot be calculated unless the Ka of HCl is given.

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