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WAEC Chemistry 2014 Theory — Question 21

Question 21 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.

3(a)(ii). Give two cations that can cause hardness in water.

Model answer

Calcium ion (Ca²⁺) and Magnesium ion (Mg²⁺).

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