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Chapter 15: Problem 10

Give the methods for the preparation of the following: (a) Marshall's acid (b) Caro's acid

Short Answer

Expert verified
Marshall's Acid (sodium Marshall) can be prepared by the oxidation of iron pyrite with sodium chlorate under aqueous conditions. Caro's Acid (permonosulfuric acid) can be prepared by the reaction between concentrated sulfuric acid and hydrogen peroxide under cold conditions.

Step by step solution

01

Preparation of Marshall's Acid

Marshall's acid, also known as sodium Marshall, is a complex iron sulfur compound. It can be prepared by the oxidation of iron pyrite (FeS2) with sodium chlorate (NaClO3) under aqueous conditions. The reaction can be represented as follows: \[ 4FeS2 + 8NaClO3 + 4H2O \rightarrow Na2[Fe2(SO4)4] + 8HCl \] Note: The reaction is done under acidic conditions, which facilitates the oxidation of iron pyrite.
02

Preparation of Caro's Acid

Caro's acid, also known as permonosulfuric acid (H2SO5), is a strong oxidizing agent. It is usually prepared by the reaction between concentrated sulfuric acid (H2SO4) and hydrogen peroxide (H2O2). This reaction produces Caro's acid and water. The reaction can be represented as follows: \[ H2SO4 + H2O2 \rightarrow H2SO5 + H2O \] Note: This reaction is conducted under cold conditions to prevent rapid decomposition of the peroxo acid.

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Most popular questions from this chapter

Discuss the properties of the following: (a) Ozone (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{SeO}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{SO}_{5}\)

Discuss the structures of the oxoacids of sulphur.

Discuss the methods for the preparation of sulphuric acid and give its properties.

Discuss the chemical properties of \(\mathrm{H}_{2} \mathrm{~S}\) and \(\mathrm{SO}_{2} \mathrm{Cl}_{2}\).

Write short notes on the following: (a) Peroxides (b) Amphoteric oxides (c) Dithionic acid (d) Frasch Process (e) Allotropes of sulphur
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