1.

The ionization constant of a certain weak acid is 10^(-4). What should be the [salt] to [acid] ratio if we have to prepare a buffer with pH = 5 using this acid and one of the salts

Answer»

`1:10`
`10:1`
`5:4`
`4:5`

Solution :`PH = -LOG K_(B) + log.(["salt"])/(["acid"])`
`5 = - log 10^(-4) + log.(["salt"])/(["acid"])`
`log.(["salt"])/(["base"]) = 1`
`(["salt"])/(["base"]) = "antilog 1" = 10 : 1`.


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