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The pH of a buffer solution prepared by ...

The pH of a buffer solution prepared by adding 10 mL of 0.1 `MCH_(3) COOH and 20 mL of 0.1` M sodium acetate will be: (given: `PK_(a)` for `CH_(3) COOH=4.74`)

A

`4.05 `

B

`3.04`

C

`5.04`

D

`3.05`

Text Solution

Verified by Experts

The correct Answer is:
C
Number of moles of `CH _(3) COOH = (MV)/(1000) = (0.1 xx 10)/( 1000) = 0.001 `
Number of moles of `CH _(3) COONa = ( MV)/( 1000) = (0.1 xx 20 )/(1000) = 0.002`
`pH = pK _(a) + log ""(["Slat"])/(["Acid"]) = 4.47 xx ""[(0.002)/(0.001)] = 5. 04`
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