WAEC Chemistry 2018 Theory — Question 21
Question 21 of 24 from the West African Examinations Council (WAEC) Chemistry 2018 Theory paper, with the correct answer and a full explanation.
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4.(c)(i) Write an equation for the reaction between chlorine and water. (ii) Why does litmus paper turn red when put in the resulting solution in 4(c)(i)?
Model answer
(i) Cl₂(g) + H₂O(l) ⇌ HOCl(aq) + HCl(aq). (ii) Because the resulting solution is acidic — both HCl (hydrochloric acid) and HOCl (chloric(I)/hypochlorous acid) formed are acids, turning litmus red.
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