Oxalic acid (C2H2O4) solution required to be warmed along with diluted sulphuric acid (H2SO4) before being titrated against potassium permanganate (KMnO4). This is important because the reaction takes place at a higher temperature.
Throughout the titration, first manganous sulphate (MnSO4) is formed; this compound acts as a catalyst for the reduction of KMnO4 by C2H2O4. Consequently, the initial reaction rate is slow, and as the reaction progresses, the reaction rate increases.
Why do you need to heat the solution before titrating it against permanganate?
By oxidizing oxalic acid in a solution of potassium permanganate, carbon dioxide is produced. To remove the CO2 gas produced in the preceding reaction, the reaction mixture must be maintained hot which is conducive to the further reaction. Therefore, before beginning the titration, the reaction mixture is warmed to 60–70 °C.
Why is oxalic acid heated and not boiled while titrating against KMnO4?
Oxalic acid (C2H2O4) is an organic compound that decomposes when heating to excessive. Also, note that we add a stoichiometric amount of concentrated sulfuric acid (H2SO4) to the titration.
Now, H2SO4 is an exceptional dehydrating agent, its converts the C2H2O4 into carbon dioxide (CO2), carbon monoxide (CO), and water (H2O). High temperatures cause this reaction to accelerate. So, we heat slowly until the vapor starts to form instead of just boiling.
Why is Mohr’s salt not heated during titration?
Mohr's salt is a very powerful reducing agent. At room temperature, it reduces the (Mn+2) cation from KMnO4. Because of this, it is not heated.
Frequently Asked Question (FAQ):
- What happens if the reaction mixture is heated above 70 degrees in the titration of oxalic acid and KMnO4 (Redox titation)?
- Why do we heat the solution before titration?
- Why is a titrate heated to nearly 60°C during the titration of KMnO4 vs. oxalic acid?
- Why is heating done for oxalic acid, and KMnO4 titration?
- Why is it necessary to heat oxalic acid and dilute H2SO4 before titration in permanganometric titration?
- Why do we heat oxalic acid solution containing sulphuric acid?
- Why oxalic acid solution is needed to be warmed between 50- 60°C before it is titrated with permanganate solution?
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