Question

the dissociation of constant of formic acid and acetic acid are 21.4×10^-5 and 1.81×10^-5.find the reletive strength of the acid

Answer 1

more is the dissociation constant, more is the acidic character

therefore,

formic acid is stronger acid than acetic acid.

Answer 2

Answer: 0.01

[H3O+]=Ka×C−−−−−−√[H3O+]=Ka×C

Let concentration of acetic acid is C1C1 and that of formic acid is C2C2

⇒1.8×10−5×C1−−−−−−−−−−−−−√=1.8×10−4×0.001−−−−−−−−−−−−−−−√⇒1.8×10−5×C1=1.8×10−4×0.001

or C1=1.8×10−4×0.0011.8×10−5=0.01
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formic acid is stronger than acetic acid