Reaction of Chlorine with NaOH

The products of the reaction of chorine with sodium hydroxide depends on what?

The temperature used.

How does chlorine react with cold dilute sodium hydroxide, NaOH?

Cl_2​(g) + 2NaOH (aq)→ NaCl(aq) + NaOCl (aq)+H₂​O(l)

Sodium chloride (NaCl), and sodium chlorate (I) (NaOCl) is formed.

How does chlorine react with heated concentrated sodium hydroxide, NaOH?

3Cl₂​(g) + 6NaOH(aq) → 5NaCl + NaClO₃​ (aq) + 3H₂​O(l)

Sodium chloride (NaCl), and sodium chlorate (V) (NaClO₃) is formed.

The reaction of chlorine with sodium hydroxide is an example of what?

A disproportionation reaction.

What is a disproportionation reaction?

A reaction where atoms of the same element become oxidised and reduced to form different products.

Chlorine is used…

In the disinfection of water supplies.

State a use for sodium chlorate (I).

Bleach.

Bleaching is an oxidation reaction in which the coloured form of the material or dye is turned colourless.

State a use for sodium chlorate (V).

Weedkiller.

State some uses of halogens and their compounds.

• PTFE is used as a non-stick layer on frying pans and bearings.

• PVC is a polymer used as waterproof coatings and window frames.

• Silver bromide is used in traditional photographic film.

• Iodine is used as an antiseptic.