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`)

Options

A. `0.1 M `
B. `0.2 M `
C. `1.0 M `
D. `10.0 M `

Answer

C

Explanation

`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 `