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How much sodium acetate should be added ...

How much sodium acetate should be added to a 0.1 M solution of `CH_(3)COOH` to give a solution of pH = 5.5 (`pK_(a)` of `CH_(3)COOH = 4.5`)

A

`0.1 M `

B

`0.2 M `

C

`1.0 M `

D

`10.0 M `

Text Solution

Verified by Experts

The correct Answer is:
C
`pH = pK_(a) + log. (["Salt"])/(["Acid"]), 5.5 = 4.5 + log . (["Salt"])/([0.1])`
`log. (["Salt"])/(0.1) = 5.5 - 4.5 = 1 `
`log. (["Salt"])/(0.1) = 5.5 - 4.5 = 1 `
`(["Salt"])/0.1 = "antilog" 1 = 10 , ["salt"] = 1 `
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