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A solution containing a weak acid and it...

A solution containing a weak acid and its conjugate acts as an acidic buffer. In a buffer the dissociation of the well acid is suppressed by its conjugate base. `(K_(1),K_(2),` and `K_(3),` of `H_(3)PO_(4)`, are `10_(-4), 10^(-4), 10^(-13)` respectively
What is the `P^(H)` of a solution obtained by mixing 100ml of `0.1 MH(3) PO_(4)`, and 150ml of 0.IM NaOH

A

`8`

B

` 9`

C

` 7`

D

`6`

Text Solution

Verified by Experts

The correct Answer is:
A
` H_3 PO_4 + NaOH to NaH_2PO_4 +H_2O `
` {:( 10 m " moles " , 15 m " moles" ,0) , ( - ,10 " moles " , 10 "moles " ), (- , 5 " moles " , 10 m " moles ") :} `
` NaH_2PO_4 + NaOH to Na_2HPO_4 + H_2O `
` {:( 10 m " moles" , 5 m " moles ",0),( 5, - , 5 m " moles " ),( 5 m " moles" ,- , 5 m " moles") :} `
` pH =P^(K_(a2)) + log ""(S)/(A) rArr pH = 8`
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