A 0.1 M aqueous solution of acetic acid is being titrated against a 0.025M NaOH solution at 25°C.Determine pH at the end point if Ka of CH3COOH is 2*10-5
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3 Answers
1357let V volume of acetic acid was taken and assume that whole of the acid is converted to its salt and, then salt hydrolyses.
MV=M'V'
0.1V=0.025V'
implies V'=4V
so total volume becomes 5V
[CH3COONa]=0.1V/5V=0.02M
Now the salt hydrolyses
so pH=(1/2)[pKw+pKa+logc]
