Chemical and Ionic Equilibrium - Result Question 126

####69. What is the pH of a 1.0M solution of acetic acid? To what volume must one litre of this solution be diluted so that the pH of the resulting solution will be twice the original value? Given, Ka=1.8×105

(1990,4M)

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Solution:

  1. CH3COOHCH3COO+H+

When concentration of CH3COOH is 1.0M, ’ α ’ is negligible,

[H+]=KaC=4.24×103M pH=log(4.24×103)=2.37

Now, let us assume that solution is diluted to a volume where concentration of CH3COOH (without considering ionisation) is x.

$$

$$

Also, desired pH=2×2.37=4.74

[H+]=1.8×105=xα

Ka=1.8×105=1.8×105α1α α=0.5 and x=3.6×105M  Volume (final) =1/3.6×105=27.78×103L



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