Question

Свежеполученный гидроксид железа(III) имеет белый цвет. Однако находясь в контактес влагой на воздухе он быстро темнеет. Что при этом происходит? Напишите уравнения реакций

Answer 1

Вы, вероятно, ошиблись, гидроксид железа(II), а не (III) окисляется кислородом воздуха, и при этом раствор буреет: 4fe(oh)2+o2+h2o=4fe(oh)3 (бурый осадок)

Answer 2

Darkening of freshly obtained iron(III) hydroxide

Freshly obtained iron(III) hydroxide has a white color. However, when it comes into contact with moisture in the air, it quickly darkens. This darkening is due to the oxidation of iron(III) hydroxide to iron(III) oxide-hydroxide, also known as rust.

The reaction can be represented by the following equation:

2Fe(OH)3 + 1/2O2 → Fe2O3·H2O

In this reaction, iron(III) hydroxide reacts with oxygen from the air to form iron(III) oxide-hydroxide, which is commonly known as rust. The rust has a characteristic reddish-brown color, which is responsible for the darkening of the iron(III) hydroxide.

It is important to note that the reaction between iron(III) hydroxide and oxygen is an example of an oxidation reaction, where iron(III) is oxidized from a lower oxidation state to a higher oxidation state.

I hope this answers your question! Let me know if you need any further clarification.