Acids And Bases 3.6

Question 1

Which of the following statements is correct?

Lemon juice (pH 2) is 1,000 times more acidic than black coffee (pH 5).

The greater the pH, the greater the [H*].

Baking soda (pH 9) is about 100 times more acidic than blood (pH 7).

To adjust the pH of a solution from 6 to 8, add vinegar.

Answer 1

Lemon juice (pH 2) is 1,000 times more acidic than black coffee (pH 5).

Question 2

Which of the following compounds is a base?

H20
MgCl2
CH3COOH
Mg(OH)2

Answer 2

Mg(OH)2

Question 3

Vhich of the following statements is correct about the aqueous solutions of the two bases CHaNHz and LiOH?

Both have a pH less than 7.

Both have a pH less than 7, but CH3NH, would have the greater pH of the two.

Both have a pH greater than 7, but LiOH would have the greater pH of the two.

Both have a pH equal to 7.

Answer 3

Both have a pH greater than 7, but LiOH would have the greater pH of the two.

Question 4

Which of the following would you combine with CH COOH to create a buffer solution?

NaOH
NaCH3COO
HCl
H3C6H5O7

Answer 4

NaCH3COO

Question 5

Mark True or False
True or false: The products of the following neutralization reaction are correctly predicted and balanced.
Ca(OH)2 + 2HBr - 2H20 + CaBrz

Answer 5

True

Question 6

Which of the following is a correct conjugate acid-base pair?

H3PO4 and HPO2-4
HNO3 and HNO2
NH4+ and NH2 -
HCI and CI-

Answer 6

HCl and Cl-

Question 7

Which of the following would be the conjugate acid of methylamine, CH3NH2?

CH3NH+3
CH3NH-
CH4
CH3COOH

Answer 7

CH3NH+3

Question 8

Which of the following ingredients would be most responsible for soda having a pH of 2.3?

Caffeine
Carbonated water
Phosphoric acid
High-fructose corn syrup

Answer 8

Phosphoric acid

Question 9

A buffer is composed of the conjugate acid-base pair shown in the following reaction:
H2PO4- HPO42- +H+
Which of the following statements are correct when acid is added? (Select all that apply.)

A The pH would decrease.

B The pH would not change.

C The acid would react with HPO4?-

D The pH would increase.

Answer 9

The pH would not change.
The acid would react with HPO4?.

Question 10

For the reaction Ba(OH)2 + 2CH COOH - Ba(CH COO)2 + H20, the acid is

Complete the sentence above with a single word.

Answer 10

Acetic

Question 11

Acid
Base
Neutral

Answer 11

Acid. Neutral Base

Question 12

1. Which of the following substances is an example of an
   acid?
   A HI
   B. COz
   C. NH3
   D. KCI

Answer 12

HI

Question 13

2. Which of the following substances are examples of a base? (Select all that apply.)
   A. KOH
   B. HCI
   C. NH3
   D. HI
   E NAOH

Answer 13

KOH
NH3
NaOH

Question 14

3. Orange juice, stomach acid, and coffee are all acid.
   Which of the following is the pH level for these substances?
   A. A pH less than 2
   B. A pH less than 7
   C. A pH at about 7
   D. A pH above 7

Answer 14

A pH less than 7

Question 15

4. Which of the following statements for this reaction is false?
   H2РОд # H* + HPO.?-
   A. The reaction is reversible.
   B. H2POg is acting as an acid.
   C. H2O4 and HPO4? could be used to make a buffer
   D. This is a neutralization reaction.

Answer 15

D. This is a neutralization reaction