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The indicator most suitable for this reaction should…

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How to determine limiting reactant

How to determine limiting reactant
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The indicator most suitable for this reaction should have a pH equal to

The indicator most suitable for this reaction should have a pH equal to

  • A. 5
  • B. 7
  • C. 3
  • D. 9

QUICK ANSWER…

B

SOLUTION 

We have a strong base reacting with an equally strong acid, so, the pH value of the resulting product will be approximately 7 (the neutral pH value). The PH of the most suitable indicator should be neither acidic nor basic, it should be neutral.

Now for the right answer to the above question:

  1. Option A is incorrect. ordinarily acid-base indicators are not expected to be acidic in themselves.
  2. Option B is correct. Normal indicators are approximately neutral, and have a PH value very close to 7.
  3. C is incorrect. acid-base indicators are not expected to be acidic in themselves.
  4. D is not the correct answer. Neither are they expected to be basic.
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QUICK TIPS…

You may please note these/this:

  • All known acid-base indicators are either weak organic acids or weak organic bases whose PH values are in themselves close to 7.
  • If the PH value of an indicator is strongly acidic, it will interfere with the neutral solution resulting to an acidic mixture.
  • If the PH value of the indicator is strongly basic, it will also interfere with the neutral solution to tilt it towards becoming basic.

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/culled from 2019 JAMB-UTME Chemistry question 34/

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