To the solution obtained by dissolving iron in hot concentrated hydrochloric acid, sodium hydroxide was added.

| September 25, 2021 | education

To the solution obtained by dissolving iron in hot concentrated hydrochloric acid, sodium hydroxide was added. The separated precipitate was separated, left in air for a long time, and then dissolved in dilute hydrochloric acid. Make an equation for the four described reactions.

When iron is dissolved in hot concentrated acid, iron (II) chloride is formed and hydrogen is released.

Fe + 2HCl → FeCl2 + H2 ↑.

When iron chloride is dissolved in sodium hydroxide, a light green precipitate is formed – iron (II) hydroxide.

FeCl2 + 2NaOH → Fe (OH) 2 ↓ + 2NaCl.

The obtained iron hydroxide in air, being oxidized by oxygen, interacting with water vapor, is converted into iron (III) hydroxide.

It falls out in the form of a brown precipitate.

4 Fe (OH) 2 + O2 + 2H2O → 4 Fe (OH) 3 ↓.

When the resulting iron hydroxide interacts with hydrochloric acid, iron (III) chloride and water are formed.

Fe (OH) 3 +3 HCl → FeCl3 + 3H2O.



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