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A water sample has calcium ion concentration 40 ppm. What mass of calcium ions is present in 5 L of the sample?

Answer and explanation

Correct answer: 200 mg

For a dilute aqueous solution, 1 ppm is approximately 1 mg per litre because 1 L of water has a mass close to 1 kg. Thus, 40 ppm means about 40 mg of calcium ions per litre. For 5 L, mass = 40 mg L⁻¹ × 5 L = 200 mg. Therefore option C is correct; 40 mg ignores the volume multiplier and the larger values use an incorrect conversion.

Related tags

PpmAqueous ConcentrationUnit ConversionMole ConceptMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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