A water sample has 10 mg impurity in 1 kg water. Approximately what is the concentration in ppm?
Answer and explanation
Correct answer: 10 ppm
For a dilute aqueous sample, ppm by mass is approximately equivalent to milligrams of solute per kilogram of water or solution. Hence 10 mg per 1 kg corresponds approximately to 10 ppm. More exactly, ppm uses total solution mass, but the tiny impurity amount makes the water mass a suitable approximation here.
Frequently asked questions
What is the correct answer to this question?
10 ppm
Why is this the correct answer?
For a dilute aqueous sample, ppm by mass is approximately equivalent to milligrams of solute per kilogram of water or solution. Hence 10 mg per 1 kg corresponds approximately to 10 ppm. More exactly, ppm uses total solution mass, but the tiny impurity amount makes the water mass a suitable approximation here.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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