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In the titration of a weak base (0.100 M piperazine, 40 mL) with a strong acid (0.100 M HCl). Calculate the pH values between 0 mL Va and 100 mL in 10 mL steps. The two Ka values of piperazine are 4.65 x 10^-6 and 1.86 x 10^-10
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