quiz 3 Flashcards


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1

Give the characteristics of a strong acid.

Ionizes completely in aqueous solutions.

Has a weaker bond to hydrogen.

Has a polar bond.

Has a very electronegative atom attached to the oxygen.

All of the above.

All of the above.

2

How many of the following are WEAK acids?
HCN HClO2 HNO3 H2PO4
Answers:

0

2

4

1

3

3

3

Identify the strongest acid.

HBr

HF

HCl

HI

Not enough information is given.

HI

4

Place the following in order of increasing acid strength.
HBrO2 HBrO3 HBrO HBrO4

Answers:

HBrO < HBrO2 < HBrO3 < HBrO4

HBrO4 < HBrO2 < HBrO3 < HBrO

HBrO < HBrO4 < HBrO3 < HBrO2

HBrO2 < HBrO4 < HBrO < HBrO3

HBrO2 < HBrO3 < HBrO4 < HBrO

HBrO < HBrO2 < HBrO3 < HBrO4

5

The stronger the acid, then which of the following is true?

The weaker the conjugate acid.

The stronger the conjugate acid.

The weaker the conjugate base.

The stronger the conjugate base.

None of the above.

The weaker the conjugate base.

6

Which of the following acids is the WEAKEST? The acid is followed by its Ka value.

C6H5CO2H, 6.3 × 10-5

HClO, 2.9 × 10-8

HC2H3O2, 1.8 × 10-5

HBrO, 2.3 × 10-9

HIO, 2.3 × 10-11

HIO, 2.3 × 10-11

7

Which of the following is NOT a conjugate acid-base pair?

NH4 +/NH3

C2H3O2⁻/HC2H3O2

H3O⁺/OH⁻

H2SO3/HSO3

All of the above are conjugate acid-base pairs.

H3O⁺/OH⁻

8

Which of the following is a Br∅nsted-Lowry base?

HCN

CH4

Cl2

NH3

None of the above are Br∅nsted-Lowry bases.

NH3

9

Which of the following is a Lewis base?

AlF3

C5H12

SiF4

H2O

None of the above are Lewis bases.

H2O

10

Which of the following is a STRONG acid?

HClO4

H2O

HCN

NH4 +

C6H5CO2H

HClO4

11

Which of the following is a WEAK acid?

HClO4

HCO2H

H2SO4

HNO3

HCl

HCO2H

12

Which of the following is a WEAK base?

NaOH

NH(CH3)2

CH2CH2

N2

None of the above are weak bases.

NH(CH3)2

13

Which of the following is a polyprotic acid?

H2SO4

HF

HCN

CH4

HC2H3O2

H2SO4

14

Which of the following is an Arrhenius base?

CH3CO2H

CH3OH

LiCl

NaOH

More than one of these compounds is an Arrhenius base.

NaOH

15

Which of the following species is amphoteric?

NH4

HF

CO3 2-

HPO4 2-

None of the above are amphoteric

HPO4 2-

16

Which of the following statements is TRUE?

A strong acid is composed of a proton and an anion that have a very strong attraction for one another.

A weak base is composed of a cation and an anion with a very weak attraction between them.

The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid.

A strong acid has a strong conjugate base.

None of the above statements are true.

The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid.

17

Which one of the following will form an acidic solution in water?

KNO3

NaF

NH4Cl

LiI

None of the above solutions will be acidic.

NH4Cl