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Grade 12Physical Chemistry

The pH of a soln obtained by mixing 100 ml of 0.2M CH3COOH with 100ml of 0.2M NaOH will be.?( pKa for CH3COOH=4.74)

Profile image of Shriya Mehrotra
11 Years agoGrade 12
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1 Answer

Profile image of Naveen Kumar
ApprovedApproved Tutor Answer11 Years ago
The formula given as:
pH=pKa....+ …......log(salt/acid)
As we are mixing equal volumes of the two solution, so the final concentration of NaOH as well as of acid would be ½ of the initial concentraton.
Hence, pH=4.74+....log(0.1/0.1)=pKa
Here we have assumed that the strong base dissociates completely(in general it is true), but the dissociation of weak acid is quite low.

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