Waec Model Questions Vol1 2021 Chemistry Question 30
Practice objective / multiple choice question 30 from the 2021 Waec Model Questions Vol1 Chemistry examination.
A 2.0 L sample of river water contains 0.120 g of dissolved Pb²⁺. To remove the lead, 0.00020 mol of Na₂S is added, which precipitates PbS according to Pb²⁺ + S²⁻ → PbS(s). The remaining solution is then passed through an ion‑exchange resin that removes 80 % of the lead still in solution. Calculate the mass of lead (in milligrams, to one decimal place) remaining in the water after both treatment steps.
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About This Question
This is Waec Model Questions Vol1 2021 Chemistry Question 30. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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