Help with assignment.

Acids and bases review quiz: 1. What are the major species present in an aqueous solution of 1.0 M H2CO3 (carbonic acid)? Carbonic acid is a diprotic acid with Ka1 = 4.3 x 10

-7 , and Ka2 = 5.6 x 10

-11 .

I) H2CO3 (II) H2O (III) H3O + (IV) HCO3

- (V) CO3

2-

A) II, III, IV and V B) I, II, III, and IV C) I, II, III, IV and V D) I and II E) II, III, IV 2. Select the correct order of acid strengths (largest to smallest) A) HClO > HBrO > HClO2 > HNO3 B) HBrO > HClO > HClO2 > HNO3 C) HNO3 > HClO2 > HClO > HBrO D) HNO3 > HClO2 > HBrO > HClO E) HClO2 > HNO3 > HClO > HBrO 3. Using the data in the table given above, consider 0.10 M solutions of the conjugate base of each acid. Which will be the strongest base? The conjugate base of: A) none of the conjugate bases will have any basic behavior and dissociate in water. B) hypobromous acid C) acetic acid D) formic acid E) phenol Review question: rank the solutions of the acids in the table in order of increasing pH Formic acid, acetic acid, hypobromous acid, phenol 4. Arrange these 0.10 M solutions in order of increasing pH: KCl, NH4Cl, HCl, CH3COONa, KOH

A) NH4Cl, KCl, CH3COONa, HCl, KOH

B) HCl, CH3COONa, KCl, NH4Cl, KOH C) HCl, NH4Cl, KCl, CH3COONa, KOH D) KOH, NH4Cl, KCl, CH3COONa, HCl, E) KOH, KCl, NH4Cl, HCl, CH3COONa

Acid Ka

HCOOH

CH3COOH

HOBr

OH

2.3 x 10-9

1.8 x 10-5

1.8 x 10-4

1.0 x 10-10

Name

Hypobromous acid

Acetic acid

Formic acid

Phenol

5. Which of these 0.10 M solutions will have a pH lower than 7.00? I) KCN II) CH3NH3I III) Al(NO3)3 A) only I B) only II C) only III D) I and III E) II and III

6. Consider the following acid-base titrations:

I) 50 mL of 0.1 M HCl is titrated with 0.2 M KOH II) 50 mL of 0.1 M CH3COOH is titrated with 0.2 M KOH

What type of titration is I: weak acid/strong base OR strong acid/strong base

What is the anion generated from the acid as KOH is added: Cl-

Does this titration curve have a buffer region: No

List the components of the buffer (if applicable): N/A

What is the pH at the equivalence point (acid/basic/neutral):

What type of titration is II: weak acid/strong base OR strong acid/strong base

What is the anion generated from the acid as KOH is added: acetate

Does this titration curve have a buffer region: Yes

List the components of the buffer (if applicable): acetic acid/acetate

What is the pH at the equivalence point (acid/basic/neutral):

Which statement is NOT true?

A) The initial pH of I is lower than that of II B) There will be a buffer region in both I and II around the half equivalence point. C) The equivalence point for I and II will occur at the same volume of base D) The equivalence point in I occurs at a lower pH than in II.

E) More than one of these statements is NOT true

7. Predict what will happen when the pH of a saturated Mg(OH)2 solution is increased to 12. The pH of a saturated solution of Mg(OH)2 = 11.03

A) More Mg(OH)2 will dissolve B) There is insufficient information to make such a prediction. C) only decrease in pH will change the solubility of Mg(OH)2. D) A pH change has no effect on solubility of Mg(OH)2 E) Some Mg(OH)2 will precipitate out

Review question: what will happen when the pH is lowered?