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Two buffer solutions P & Q with pH value...

Two buffer solutions P & Q with pH values 4.0 and 6.0 are prepared from acid HA and the salt KA . Both the buffer are 0.5 M in HA . The pH of the mixture of the solution obtained by mixing equal volumes of the two buffers is (pKa of acid =5)

A

`5. 69`

B

`4.71`

C

` 6. 71`

D

`4. 301`

Text Solution

Verified by Experts

The correct Answer is:
A
`pH_1 = pKa +log "" ( S_1)/(A) ` ` 4 = pKa +log ""( S_1)/(0.5) = 5+ log ""( S_1)/(0.5)`
` PH_2 =pKa +log "" (S_2)/(A) `
` 6= pKa +log ""( S_2)/(0.5) = 5 + log ""(S_2)/( 0.5)`
` S_1 =0.05 ,S_2 =5`
o mixing , pH =pKa ` + log ""(V_5 +0.05 V)/( 0.5 xx 2V) `
`= 5 +log ""( 5.05)/( 0.5 xx 2 ) = 5.7`
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