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Reaction with Water

Disproportionation is a reaction when one element undergoes oxidation and reduction at the same time.Chlorine with waterCl2 + H2O → HCl + HClOBacteria are killed by adding chlorine to water. The bacteria are killed by chloric (I) acid HClO which acts as a weak bleach. Adding an indicator, the indicator first turns red because of the acid then is bleached by the HClO.
Hydrogen halides readily react with water to form acidic solutions. Hydrogen fluoride is a weak acid so the reaction is reversible.HF + H2O ⇌ H3O+ + F-HCl + H2O → H3O+ + Cl-

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Specification: AQA Chemistry (7404), AS-level, 3.2.3.2 Uses of chlorine and chlorate(I). Topic: Group 7.

Key terms in this lesson

Oxidation
The addition of oxygen, the removal of hydrogen, the loss of electrons, or an increase in oxidation number.
Reduction
The removal of oxygen, the addition of hydrogen, the gain of electrons, or a decrease in oxidation number.
Disproportionation
A redox reaction in which the same element is simultaneously oxidised and reduced.

More in Group 7

All 20 lessons in Group 7 · All AQA AS-level Chemistry topics