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Question

Why HCl is not used in titration?


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Solution

HCl:

  1. At normal temperature and pressure, hydrogen chloride HCl is a gas made up of the elements hydrogen and chlorine.
  2. Hydrochloric acid is the name for a gas solution in water.

Reason for HCl is not used in titration:

  1. Typically, we add HCl to the KMnO4 solution to make it acidic. However, the HCl is oxidized when a few drops of HCl are added to the potassium permanganate solution.
  2. This is due to KMnO4's potent oxidizing properties. It produces chlorine gas by oxidizing the HCl. The medium does not turn acidic as a result. However, an acidic medium is required for titration.
  3. As a result, we rarely add weak acid during titration. When HCl is introduced to a KMnO4 solution, the following reaction occurs: 2KMnO4+16HCl2KCl+2MnCl2
  4. H2SO4 is preferred over HCl in this case. This is so that the solution is more acidic than HCl due to the significant acidity of H2SO4. Therefore, when we utilize H2SO4 in titration, the final results are more accurate.
  5. While HCl only produces one hydronium ion, H2SO4 produces two. HNO3 is another alternative to HCl. Also excluded from the titration procedure is HNO3. Mineral acids are another name for HCl and HNO3.

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