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Sera titrates a 10.00 mL sample of a 0.0750 M weak base (A4-) with 0.2500 M...

Sera titrates a 10.00 mL sample of a 0.0750 M weak base (A4-) with 0.2500 M HCl, a strong monoprotic acid. The Kb values for this base are Kb1 = 2.00 x 10-3, Kb2 = 3.00 x 10-6, Kb3 = 4.00 x 10-9, and Kb4 = 5.00 x 10-11.

Calculate the volume of HCL, in mL, needed to reach the first equivalence point of this titration.

Calculate the pH of the titration solution after 4.50 mL of HCl has been added.

Calculate the pH of the titration solution after 8.00 mL of HCl has been added.

Calculate the pH of the titration solution at the third equivalence point.   

Calculate the pH at the fourth and final equivalence point in this titration.

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