Question

Calculate pH of the mixture formed by the addition of 5, 9, 9.5, 9.9,9.95, 10, 10.05 and 10.1 mL of 0.5M KOH solution to 100 mLof 0.05 HBr solution. What will be the most suitable indicator for this titration?

Answer 1

(i) Meq. of KOH in mixture = 5 x 0.5 = 2.5

Meq. of HBr in mixture = 100 x 0.05 = 5

Meq. of HBr left in mixture = 5 - 2.5 = 2.5

Indicator used is phenolphthalein.