1.

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)

Answer»

0.1 M
0.2 M
`1.0 M`
`10.0 M`

SOLUTION :`pH = pK_(a) + log.(["Salt"])/("Acid") , 5.5 = 4.5 + log.(["Salt"])/("Acid")`
`log.(["Salt"])/("Acid") = 5.5 - 4.5 = 1`
`(["Salt"])/(0.1) = "antilog 1" = 10, ["Salt"] = 1` .


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