Preparing Insoluble Salts

  1. Insoluble salts can be made by ionic precipitation (is also called double decomposition/double displacement).
  2. This involves mixing a solution that contains its positive ions with another solution that contains its negative ions.

Example:
Write the equation of the reaction that can be used to prepare the following salt:
  1. Calcium sulphate
  2. Lead chloride
  3. Copper carbonate

Answer:
a. Calcium sulphate
CaCl2 + NaSO4 → CaSO4 + 2NaCl
Ca(NO3)2 + ZnSO4 → CaSO4 + Zn(NO3)2

b. Lead chloride
Pb(NO3)2 + 2NaCl → PbCl2 + 2NaNO3

c. Copper carbonate
CuSO4 + Na2CO3 → CuCO3 + Na2SO4
CuCl2 + K2CO3 → CuCO3 + 2KCl
Cu(NO3)2 + Na2CO3 → CuCO3 + 2NaNO3




4 comments:

  1. This comment has been removed by the author.

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  2. How to know those salts can only reacts with what reactants? How to differentiate it?

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  3. can i use sulphuric acid instead of sodium sulphate?

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  4. can i use sulphuric acid instead of sodium sulphate?

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