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A buffer solution is prepared by mixing 100.0mL of 2.0M lactic acid with 100.0mL of 2.0M sodium lactate. This buffer is then diluted 1:5 by adding 40.0mL of the buffer to 160.0mL of deionized water. Calculate the volume (in mL) of 2.0M HCl required to change pH of 100.0mL of this diluted buffer by one pH unit. Ka (lactic acid) = 1.38x10^-4
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