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Two buffer, (X) and (Y) of pH 4.0 and 6....

Two buffer, (X) and (Y) of pH `4.0` and `6.0` respectively are prepared from acid HA and the salt NaA. Both the buffers are `0.50` M in HA. What would be the pH of the solution obtained by mixing equal volumes of the two buffers ? `(K_(HA)=1.0xx10^(-5))`

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Calculate (salt] in X and Y using Henderson equation. Find `"[salt]"_(mix)` and again apply the same equation
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