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A buffer solution of pH 9 is to be prepa...

A buffer solution of pH 9 is to be prepared by mixing `NH_4Cl` and `NH_4OH`. Calculate the number of moles of `NH_4Cl` that should be added to 2 litre of 1 M `NH_4OH` solution , `K_b` = `1.8 X 10^(-5)`

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