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JAMB Chemistry 1978 Question 48

Question 48

Volumetric Analysis

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

  1. A.Litmus paper
  2. B.Phenolphthalein
  3. C.Methyl orange
  4. D.Universal indicator
  5. E.None of these.
Show the answer and explanation

Answer: C (Methyl orange)

Explanation

Sodium carbonate is a weak base and HCl a strong acid, so the end point is acidic; methyl orange changes colour in that range. Phenolphthalein would only show the first (half) neutralisation.