In some cases, the titration curve for a mixture of two acids has the same appearance as that for a single acid; in other cases it does not.

(a) Sketch the titration curve (pH versus volume of titrant) for the titration with 0.200 M NaOH of 25.00 mL of a solution that is 0.100 M in HCl and 0.100 M in HNO₃. Does this curve differ in any way from what would be obtained in the titration of 25.00 mL of 0.200 M HCl with 0.200 M NaOH? Explain.

(b) The titration curve shown was obtained when 10.00 mL of a solution containing both HCl and H₃PO₄ was titrated with 0.216 M NaOH. From this curve, determine the stoichiometric molarities of both the HCl and the H₃PO₄.

(c) A 10.00 mL solution that is 0.0400 M H₃PO₄ and 0.0150 M NaH₂PO₄ is titrated with 0.0200 M NaOH. Sketch the titration curve.

Transcribed Image Text:

12.0 10.0 8.0 6.0 4.0 2.0 5.0 L " 10.0 15.0 20.0 25.0 Volume of 0.216 M NaOH, mL 1 1 1 30.0 35.0