Waec Model Questions Vol1 2025 Chemistry Question 38
Practice objective / multiple choice question 38 from the 2025 Waec Model Questions Vol1 Chemistry examination.
A lake of volume 2.0 × 10⁶ L receives atmospheric deposition of lead at a rate of 0.5 mg m⁻² day⁻¹ over its surface area of 1.0 × 10⁴ m². Lead partitions between water and sediment with a distribution coefficient Kd = 1.2 × 10³ L kg⁻¹. The lake contains 5.0 × 10⁴ kg of sediment. Assuming that the deposited lead is instantaneously at equilibrium between water and sediment and that the total lead present equals the daily deposited amount, calculate the concentration of dissolved lead in the lake water in µg L⁻¹.
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This is Waec Model Questions Vol1 2025 Chemistry Question 38. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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