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Calculate the pH of 0.5L of a0.2 M NH(4)...

Calculate the pH of `0.5L` of a`0.2 M NH_(4)Cl-0.2 M NH_(3)` buffer before and after addition of (a)` 0.05` mole of `NaOH` and (b) `0.05` mole of `HCl`. Assume that the volume remains constant.[Given:`pK_(a)`of `NH_(3)=4.74]`

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