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One litre of 1 M solution of an acid HA(...

One litre of 1 M solution of an acid `HA(K_(a)=10^(-4)" at "25^(@)C)` has pH = 2. It is diluted by water so the new pH becomes double. The solution was diluted to `yxx10^(z)ml`. The value of `(y+z)/(2)` is :

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