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A salt that could be prepared by double decomposition is 

Chemistry
WAEC 2025

A salt that could be prepared by double decomposition is 

  • A. sodium trioxocarbonate (IV)
  • B. barium trioxonitrate (V)
  • C. lead (II) trioxonitrate (V)
  • D. silver chloride
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Correct Answer: Option D
Explanation

Double decomposition (also known as a precipitation reaction) is the standard laboratory method for preparing insoluble salts. In this process, two soluble salts are mixed in aqueous solution; their ions exchange partners to form one soluble product and one insoluble solid (precipitate).

Silver chloride (AgCl) is a highly insoluble salt. It is typically prepared by reacting two soluble solutions, such as silver nitrate (AgNO\(_3\)) and sodium chloride (NaCl).

                  AgNO\(_3\)  +  NaCl → AgCl + NaNO\(_3\)

 


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