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JAMB Chemistry 2008 Question 21

Question 21

Acids, Bases and Salts

Insoluble salts can be prepared by

  1. A.titrating an alkali against an appropriate acid
  2. B.reacting an acid with trioxocarbonate (IV) salt
  3. C.direct combination of the elements which make up the salt.
  4. D.mixing two soluble compounds containing the metallic radical and the acidic radical.
Show the answer and explanation

Answer: D (mixing two soluble compounds containing the metallic radical and the acidic radical.)

Explanation

Insoluble salts are made by double decomposition (precipitation): mixing two soluble salts, e.g. AgNO3 + NaCl → AgCl↓ + NaNO3.