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50 mL of 0.05 M Na(2)CO(3) is titrate...

50 mL of 0.05 M `Na_(2)CO_(3) is titrated against 0.1 M HCl. On adding 40 mL of HCl, pH of the solution will be `[Given : For H_(2)CO_(3),pK_(a1)=6.35,pK_(a2)=10.33,log 3=0.477,log 2=0.30]`

A

`6.35`

B

`6.526`

C

`8.34`

D

`6.173`

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