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Calculate approximate pH of the resultan...

Calculate approximate pH of the resultant solution formed by titration of 25 mL of 0.04 M `Na_(2)CO_(3)` with 50 mL of 0.025 M HCl. `[Given : pK_(a1)=6.4 and pK_(a2)=10.3 for H_(2)CO_(3)]`

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