Neco Model Questions Vol1 2025 Chemistry Question 14
Practice objective / multiple choice question 14 from the 2025 Neco Model Questions Vol1 Chemistry examination.
A lake contains dissolved calcium at a concentration of 2.5 mg L⁻¹ as Ca²⁺ and bicarbonate at 150 mg L⁻¹ as HCO₃⁻. The water pH is 8.5. Using the second dissociation constant of carbonic acid K₂ = 4.7×10⁻¹¹ and the solubility product of calcite Ksp = 4.8×10⁻⁹ at 25 °C, calculate the saturation index (SI) for calcite and state whether the water is undersaturated, saturated or supersaturated with respect to calcite.
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This is Neco Model Questions Vol1 2025 Chemistry Question 14. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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