At a certain temperature, the dissociation constants of formic and acetic acids are 1.8 × 1 0 - 4 and 1.8 × 1 0 - 5 respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solutions is equal to

Question

At a certain temperature, the dissociation constants of formic and acetic acids are 1.8 × 1 0 - 4 and 1.8 × 1 0 - 5 respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solutions is equal to, 0.001 M, 0.01 M, 0.1 M, 0.0001 M

MARKS App · Accepted Answer

H + = K a ⋅ C For acetic acid H + = 1 .8 × 10 − 5 × C For Formic acid H + = 1 .8 × 10 − 4 × 10 − 3 1 .8 × 10 − 5 × C = 1 .8 × 10 − 4 × 10 − 3 C = 10 − 2 = 0.01 M

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