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During titration H2SO4 is preferably use...

During titration `H_2SO_4` is preferably used over HCl and `HNO_3` to make the solution acidic because

A

`H_2SO_4` is a strong oxidising agent and it reacts with `KMnO_4` during titration

B

Some `KMnO_4` is consumed during the reaction with `H_2SO_4`

C

`H_2SO_4` does not react with `KMnO_4` or the reducing agent used

D

`H_2SO_4` can turn colourless `KMnO_4` to pink at the end point

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question of why `H2SO4` is preferably used over `HCl` and `HNO3` to make the solution acidic during titration, we can analyze the properties and reactions of these acids with `KMnO4`, which is commonly used as an oxidizing agent in titrations. ### Step-by-Step Solution: 1. **Understanding the Role of Acids in Titration**: - In titrations involving `KMnO4`, an acidic medium is required to ensure that the `KMnO4` acts as a proper oxidizing agent. The choice of acid can significantly affect the outcome of the titration. 2. **Analyzing `HCl`**: - `HCl` is a strong acid, but it also acts as a reducing agent. When `HCl` is used in the titration, it can react with `KMnO4`, consuming some of the `KMnO4` that is supposed to oxidize the analyte. This means that more `KMnO4` would be required to achieve the endpoint, leading to inaccurate results. 3. **Analyzing `HNO3`**: - `HNO3` is also a strong acid and a powerful oxidizing agent due to nitrogen being in a +5 oxidation state. When `HNO3` is used, it can oxidize the analyte itself, as well as react with `KMnO4`. This results in less `KMnO4` being available for the titration, which again leads to inaccuracies. 4. **Analyzing `H2SO4`**: - `H2SO4` is a strong acid but does not act as an oxidizing agent in this context. It does not react with `KMnO4` or interfere with the oxidation-reduction process. Therefore, it does not consume any `KMnO4`, allowing for a more accurate titration. 5. **Conclusion**: - The best choice for making the solution acidic during titration with `KMnO4` is `H2SO4` because it does not react with `KMnO4` and does not interfere with the titration process. This ensures that the amount of `KMnO4` used is solely for the oxidation of the analyte, leading to more accurate results. ### Final Answer: `H2SO4` is preferred over `HCl` and `HNO3` during titration with `KMnO4` because it does not react with `KMnO4`, allowing for accurate determination of the endpoint without consuming any of the titrant.
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