quiz 3 Flashcards

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.

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

0

2

4

1

3

Identify the strongest acid.

HBr

HF

HCl

HI

Not enough information is given.

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

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.

Which of the following acids is the WEAKEST? The acid is followed by its K_a 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

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.

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

HCN

CH₄

Cl₂

NH₃

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

Which of the following is a Lewis base?

AlF₃

C₅H₁₂

SiF₄

H₂O

None of the above are Lewis bases.

Which of the following is a STRONG acid?

HClO₄

H₂O

HCN

NH₄ ⁺

C₆H₅CO₂H

Which of the following is a WEAK acid?

HClO₄

HCO₂H

H₂SO₄

HNO₃

HCl

Which of the following is a WEAK base?

NaOH

NH(CH₃)₂

CH₂CH₂

N₂

None of the above are weak bases.

Which of the following is a polyprotic acid?

H₂SO₄

HF

HCN

CH₄

HC₂H₃O₂

Which of the following is an Arrhenius base?

CH₃CO₂H

CH₃OH

LiCl

NaOH

More than one of these compounds is an Arrhenius base.

Which of the following species is amphoteric?

NH₄⁺

HF

CO₃ ^2-

HPO₄ ^2-

None of the above are amphoteric

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.

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

KNO₃

NaF

NH₄Cl

LiI

None of the above solutions will be acidic.