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Cyanic acid (HOCN) is a weak acid and has Ka = 3.5 × 10–4. The titration...

Cyanic acid (HOCN) is a weak acid and has Ka = 3.5 × 10–4. The titration is begun with 0.0400 moles of HOCN in 1.00 L of solution in an Erlenmeyer flask below a burette holding KOH. Gradually 0.005 M KOH in the burette is added to the acid to titrate it.   

                                    a) What is the pH after 80 mL of KOH have been added to the solution?

                                    b) What is the pH after 100 mL of KOH have been added to the solution?

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