CH-1074

Strong and weak acids

Chemistry · Secondary 4 · Medium · Strong and weak acids

The dissociation constants,

K_a

, of two organic acids are:

Ethanoic acid:

1.8 \times 10^{-5}

Chloroethanoic acid:

1.4 \times 10^{-3}

Which statement about their relative strengths is correct?

Chloroethanoic acid is stronger because it has a larger $K_a$ .
Ethanoic acid is stronger because it has a smaller $K_a$ .
Both acids have the same strength because both are weak acids.
Ethanoic acid is stronger because it has no halogen atoms.

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