Topic Content:
- Action of an Acid Anhydride on Water
- Combination of Constituent Elements
- Displacement Reaction
- PrecipitationPrecipitation is any liquid or frozen water that forms in the atmosphere and falls back to the Earth. It comes in many forms, like rain, sleet, and snow. More Reaction
In this topic, we will outline the general methods for the preparation of acids.
1. Action of an Acid Anhydride on Water:
An acid anhydride is an oxide of a non-metal that dissolves in water to produce acid.
Example: CO2, SO2, SO3, NO2, etc.
(i) CO2(g) + H2O(l) → H2CO3(aq) (Trioxocarbonate (IV) acid)
(ii) SO2(g) + H2O(l) → H2SO3(aq) (Trioxosulphate (IV) acid)
(iii) SO3(g) + H2O(l) → H2SO4(aq) (Tetraoxosulphate(VI) acid)
(iv) \( \scriptsize \: 2NO_{2(g)} \: + \: H_2O_{(l)} \: \rightarrow \: \underset {(Trioxonitrate \: (V) \: acid)}{HNO_{3(aq)}} \: + \: \underset {(dioxonitrate \: (III) \: acid)}{HNO_2} \)
Nitrogen (IV) oxide (NO2) is referred to as mixed anhydride because when NO2 dissolves in water, it forms two acids HNO3 and HNO2.
2. Combination of Constituent Elements:
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