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1 L water contains 0.05 g lead ions. Assuming a very dilute solution what is the concentration in ppm?

Answer and explanation

Correct answer: 50 ppm

For a very dilute aqueous solution, 1 L of water is approximately 1 kg because water has density close to 1 g mL−1. The lead-ion mass is 0.05 g, which equals 50 mg. Therefore, concentration = 50 mg ÷ 1 kg = 50 mg kg−1, and mg kg−1 is numerically equal to ppm. Hence option B is correct; the other choices arise from decimal or unit-conversion errors.

Related tags

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

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