A 1 kg solution contains 0.002 g solute. What is the concentration in ppm?
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Answer and explanation
Correct answer: 2 ppm
Convert the solute mass to milligrams: 0.002 g × 1000 mg g−1 = 2 mg. The sample contains 2 mg solute in 1 kg solution. Since 1 mg per kg corresponds to 1 ppm by mass, the concentration is 2 ppm. Therefore B is correct. The main possible error is confusing 0.002 g with 0.2 or 20 mg.
Frequently asked questions
What is the correct answer to this question?
2 ppm
Why is this the correct answer?
Convert the solute mass to milligrams: 0.002 g × 1000 mg g−1 = 2 mg. The sample contains 2 mg solute in 1 kg solution. Since 1 mg per kg corresponds to 1 ppm by mass, the concentration is 2 ppm. Therefore B is correct. The main possible error is confusing 0.002 g with 0.2 or 20 mg.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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