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Question

A solution of H2C2O4 requires 200ml of NaOH for complete neutralization. The pH of the solution when 120ml of NaOH is added is: (Given :Ka1=104 and Ka2=107 for H2C2O4)[log2=0.30]

A
3.4
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B
4.6
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C
5.6
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D
6.4
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Solution

The correct option is A 6.4
One mole of H2C2O4 requires 2 moles of NaOH for complete neutralization. Thus, when 120 ml is used:
H2C2O4+NaOHNaHC2O4+H2O
100x 200x 0
0 100x 100x
Again,
NaHC2O4+NaOHNa2C2O4
100x 20x 0
80x 0 20x
pH=pKa2+log20x80x=log(107)+log14

pH=6.4

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