Which is the stronger acid: chloric(I) acid HClO with a K a of 3 . 7 × 10 - 8 mol dm - 3 , or hydrocyanic acid HCN with a K a of 4 . 9 × 10 - 10 mol dm - 3 . Then explain how the K a value enables you to decide.

K a is acid dissociation constant and represents the strength of the acid. pK a is the - log of K a . They have an inverse relationship. Larger the K a , smaller the pK a and stronger the acid. we have given, chloric I acid HClO with a K a of 3 . 7 × 10 - 8 mol dm - 3 , Hydrocyanic acid HCN with a K a of 4 . 9 × 10 - 10 mol dm - 3 . From the above given values of K a , chloric I acid has more K a value, so that is stronger acid than hydrocyanic acid.

E M B I B E

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 26 - Carboxylic Acids and their Derivatives>EXAM-STYLE QUESTIONS>Q 2

HARD

AS and A Level

IMPORTANT

Earn 100

Explain the relative ease of hydrolysis for the compounds chlorobenzene, butanoyl chloride, and $1$ -chlorobutane.

Important Questions on Carboxylic Acids and their Derivatives

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 26 - Carboxylic Acids and their Derivatives>BEFORE YOU START>Q 1

Which is the stronger acid: chloric(I) acid

(HClO)

with a

K_{a}

of

3.7 \times 10^{- 8} mol {dm}^{- 3}

, or hydrocyanic acid

(HCN)

with a

K_{a}

of

4.9 \times 10^{- 10} mol {dm}^{- 3}

. Then explain how the

K_{a}

value enables you to decide.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 26 - Carboxylic Acids and their Derivatives>BEFORE YOU START>Q 2

Using an arrowhead and the symbols for a partial negative charge and a partial positive charge, add labels to both of the following bonding pairs of atoms: