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The dissociation constant of an acid HA ...

The dissociation constant of an acid HA at `25^@C` is `1.34 xx 10^(-8)` . How many moles of sodium salt of this acid should be added to one litre of an aqueous solution containing 0.02 mole of this acid to obtain a buffer solution of pH 4.75? What will be the pH if 0.01 mole of HCl is dissolved in the buffer solution?

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0.015 mole
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