Multiple choice

Which indicator is used in the titration of sodium carbonate with hydrocholric acid taken in burette?

  1. Phenolphthalein for first equivalence point and methyl orange for second equivalence point

  2. Methyl orange for first equivalence point and phenolphthalein for second equivalence point

  3. Either methyl orange or phenolphthalein for both equivalence points

  4. Thymol blue for both equivalence points
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct and can be explained a follows: In the titration of sodium carbonate with hydrochloric acid, first equivalence point appears at pH of about 8.3 and we know that phenolphtahein turns from colourless to fuchsia color at pH>8.2, hence phenolphthalein is used as an indicator for the first equivalence point whereas second equivalence point appears at pH of about 3.9 hence we use methyl orange as indicator for second equivalence point.

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