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Preparation of Salts.

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  • Essay length: 968 words
  • Submitted: 18/03/2004
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GCSE Aqueous Chemistry

The first 200 words of this essay...

PREPARATION OF SALTS

1. INSOLUBLE SALTS

Soluble salt 1(aq) + soluble salt 2(aq) insoluble salt + soluble salt (aq)

acid 1(aq) acid 2(aq)

Pb(NO3)2(aq) + Na2SO4(g) PbSO4(s) + 2NaNO3(aq)

Pb2+(aq) + SO2-4(aq) PbSO4

To prepare a salt, you should firstly thoroughly mix the solution, then you should filter it to remove any precipitate. Next, you should, wash with distilled water and finally leave to dry in the oven.

2. SOLUBLE SALTS

a. Filtration

i. acid + base salt + water

H2SO4(aq) + CuO(s) CuSO4(aq) + H2O(l)

H2SO4(aq) + Mg(OH)2(s) MgSO4(aq) + H2O(l)

ii. acid + insoluble metal carbonate salt + water + carbon dioxide

H2SO4(aq) + CuCO3(s) CuSO4(aq) + H2O(l) + CO2(g)

iii. acid + reaction metal salt + hydrogen

H2SO4(aq) + Mg(s) MgSO4(aq) + H2(g)

The base or the metal carbonate must be insoluble so that we can remove the excess through the method of filtration. The metals that we can use must react with acids but must not react with water as this would contaminate the salt with metal hydroxide. The metals that we can use are:

Magnesium (Mg)

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