WAEC - Chemistry (1997 - No. 12)
Which of the following is a general method of preparing acids?
Direct combination of constituent elements
Double decomposition involving a salt solution
Reaction between an anhydride and water
Reaction between a base and an amphoteric oxide
Dissolution of hydroxides followed by neutralization
Explanation
There are several methods of preparation of acids. These include the following:
1. By the reaction between an acidic oxide of a non-metal (acid anhydride) and water.
SO2(g) + H2O(l) → H2SO3(aq) Trioxosulphate(IV)
P4010(s) + 2H2O(l) → 4HPO3(aq) Trioxophosphate(V)
1. By the reaction between an acidic oxide of a non-metal (acid anhydride) and water.
SO2(g) + H2O(l) → H2SO3(aq) Trioxosulphate(IV)
P4010(s) + 2H2O(l) → 4HPO3(aq) Trioxophosphate(V)
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