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JAMB Chemistry 1995 Question 20

Question 20

Acids, Bases and Salts

Which of the following solutions will have a pH < 7?

  1. A.Na2SO4(aq)
  2. B.NaCl(aq)
  3. C.Na2CO3(aq)
  4. D.NH4Cl(aq)
Show the answer and explanation

Answer: D (NH4Cl(aq))

Explanation

NH4Cl is the salt of a strong acid and a weak base. It hydrolyses in water to give an acidic solution, while Na2CO3 is alkaline and the other two are neutral.