WAEC Chemistry 2019 Objective — Question 21

Question 21 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The most suitable indicator for the reaction between NaOH(aq) and HCOOH(aq) is

A. bromocresol
B. methyl orange
C. methyl red
D. phenolphthaleinCorrect

Explanation

This is a weak acid (methanoic acid) vs strong base (NaOH) titration; phenolphthalein (colour change in the alkaline range) is the suitable indicator.

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