100 ml 0.1 M H_3PO_4 solution is being titrated with 0.1 M NaOHsolution. 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 ?

100 ml 0.1 M H_3PO_4 solution is being titrated with 0.1 M NaOHsolutio

1.	100 ml 0.1 M H_3PO_4 solution is being titrated with 0.1 M NaOHsolution. 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 ?
Answer» `3` `4` `6` `5.3` Solution :After ADDING 50 ml NaOH, buffer ` (H_3PO_4 + NaH_2 PO_4) ` with MAXIMUM capacity is obtained. ` therefore pH =P^(Ka_2) =3`