Why does the green precipitate obtained from an iron (II) salt slowly turn brown when in contact with air?

Answer 1

Due to oxidation.

Oxidation of iron (ll) in the presence of air results in the formation of iron (lll) salt, which is responsible for the brown color.

Loss of electrons, gain of oxygen, loss of hydrogen, or increase in the oxidation state are all considered forms of oxidation.

In this instance, the salt's iron content rises from +2 to +3.

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Answer 2

Peyton Adams

The green precipitate obtained from an iron (II) salt slowly turns brown when in contact with air due to the oxidation of iron (II) ions to iron (III) ions. This process is known as oxidation and involves the transfer of electrons from the iron (II) ions to oxygen molecules in the air. As a result, iron (III) ions are formed, which are typically brown in color. This change in oxidation state causes the green precipitate to darken over time.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.