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JAMB Chemistry 2020 Question 28

Question 28

Qualitative Analysis

Which of these salts will give a precipitate when treated with NaOH solution?

  1. A.NH4Cl
  2. B.AlCl3
  3. C.CH3COONa
  4. D.Na2CO3
Show the answer and explanation

Answer: B (AlCl3)

Explanation

Al3+ + 3OH− → Al(OH)3, a white gelatinous precipitate. NH4Cl gives ammonia gas, and the sodium salts give no change.