50mL of 0.05 M Na_(2)CO_(3) is titrated against 0.1 M HCl. On adding 4 – InterviewSolution

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1.	50mL of 0.05 M Na_(2)CO_(3) is titrated against 0.1 M HCl. On adding 40mL of HCl, pH of the solution will be [ Given : For H_(2) CO_(3), pK_(a_(1)) = 6.35, pK_(a_(2)) = 10.33, log 3 = 0.477, log 2 = 0.30 ]. ( Express answer is nearest integer ) .
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