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Preparation of Nitric Acid

A mixture of ...

Question

A mixture of formic acid oxalic acid is heated with conc. h2so4. the gas produced is collected and on treatment with KOH solution.

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Solution

When mixture of acids are treated with conc. sulphuric acid, the acid acts as dehydrating agent. The following reactions takes place:
Formic acid-
HCOOH $\to_{H e a t}^{c o n c . H_{2} S O_{4}}$ H₂O + CO(g)

Oxalic acid-
C₂H₂O₄ $\to_{H e a t}^{c o n c . H_{2} S O_{4}}$ H₂O + CO(g) + CO₂(g)

The carbon dioxide produced can be collected on treatment with KOH solution in the form of potassium carbonate.
2CO₂+ 2KOH $\to$ 2KCO₃(s) + H₂

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