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50 mL of 0.5 M Na2CO3 is titrated again...

50 mL of 0.5 M Na2CO3 is titrated against 0.1 M HCl. On adding 40 mL of HCl, pH of the solution will be:[Given for H2CO3 , pK a 1=6.35; pK a 2=10.33; log3=0.477, log2=0.30]

A

`6.35`

B

`6.526`

C

`8.34`

D

`6.173`

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