Question

Value of dissociation constant of acetic acid is 10^-6

Answer 1

Answer:

Answer:

Given: dissociation constant of acetic acid is equal to 10 to the power minus 6 and dissociation constant of formic acid is equal to 10 to the power minus 5 . first we will find PK of acetic acid and PK of formic acid and subtract them we will find the answer plus one.

Answer 2

Question is incomplete , complete question is :

Value of dissociation constant of acetic acid is $10^{-6}$  , where as dissociation constant of formic acid is $10^{-5}$ . Which of the following will be the value of pKa (acetic acid) - pKa (formic acid)?

A) 1, B) 10 , C) $10^{-1}$   D) -1

The correct answer is A.

Explanation:

$pKa=-\log[K_a]$

Dissociation constant of acetic acid = $K_a=10^{-6}$

$pKa=-\log[10^{-6}]=6$

Dissociation constant of formic  acid = $K_a'=10^{-5}$

$pKa'=-\log[10^{-5}]=5$

The value of pKa - pKa' = 6 -5 = 1

The value of pKa (acetic acid) - pKa (formic acid) is 1.

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