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Introduction to Inorganic Chemistry

The indicator...

Question

The indicator used in titrating weak acid (e.g. oxalic acid) with a strong base (e.g. caustic soda) solution is

A

methyl orange

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B

methyl red

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C

fluorescein

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D

phenolphthalein

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Solution

The correct option is D phenolphthalein
Phenolphthalein is chosen because it changes colour at the pH range of 8.3 - 10.0

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Q. The indicator which is used to find the strength of caustic soda solution with the help of oxalic acid is:

Q. (A) In general phenolphthalein is used as an indicator for the titration of weak acid

(C H_{3} C O O H)

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Q. Assertion: In general, phenolphthalein is used as an indicator for the titration of weak acid (HA) against strong base (NaOH).
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