1.

A buffer solution has equal volumes of 0.2 M NH_(4)OH and 0.02 M NH_(4)Cl. The pK_(b) of the base is 5. The pH is

Answer»

10
9
4
7

Solution :`pOH = pK_(b) + LOG.(["salt"])/(["base"])`
`= 5 + log.(0.02)/(0.2) = 5 + log.(1)/(10) = 5 + (-1) = 4`
`pH = 14 - pOH = 14 - 4 = 10`.


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