Three monoprotic acids have the following acid-dissociation constants at 25 °C: Acid…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Three monoprotic acids have the following acid-dissociation constants at 25 °C: Acid X:

K_a = 1 \times 10^{-5}

Acid Y:

K_a = 4 \times 10^{-4}

Acid Z:

K_a = 6 \times 10^{-8}

Which of the following correctly ranks the conjugate bases (X⁻, Y⁻, Z⁻) from strongest to weakest? (a)

X^- > Z^- > Y^-

(b)

Z^- > X^- > Y^-

(c)

Y^- > X^- > Z^-

(d)

X^- > Y^- > Z^-