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Two buffers, (X) and (Y) of pH 4 and 6 r...

Two buffers, (X) and (Y) of pH 4 and 6 respectively are prepared from acid HA and salt Na A. Both the buffers are 0.5 M in HA. What would be the pH of the solution obtained by mixing equal volume of the two buffers?(ka=1`x`10^-5`)

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