WAEC Chemistry 2014 Theory — Question 7
Question 7 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.
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1(f). State the effect of each of the following aqueous solutions on litmus paper: (i) Na₂SO₄(aq); (ii) AlCl₃(aq)
Model answer
(i) Na₂SO₄(aq): No effect on litmus paper (neutral — salt of a strong acid and strong base). (ii) AlCl₃(aq): Turns blue litmus paper red (acidic — salt of a weak base and strong acid, undergoes hydrolysis).
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