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100 ml 0.1 M H3PO4 solution is being tit...

100 ml 0.1 `M H_3PO_4` solution is being titrated with 0.1 M NaOH solution. The pH of the reaction mixture keeps increasing with addition of NaOH. The successive dissociation constant of `H_3PO_4 " are " 10^(-3) , 10 ^(-6) and 10^(-14) ` respectively.
What is the pH of the reaction mixture after adding 50 ml of NaOH ?

A

`3`

B

`4`

C

`6`

D

`5.3`

Text Solution

Verified by Experts

The correct Answer is:
A
After adding 50 ml NaOH, buffer ` (H_3PO_4 + NaH_2 PO_4) ` with maximum capacity is obtained.
` therefore pH =P^(Ka_2) =3`
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