12 mg impurity is present in 3 L water. Assuming a very dilute solution, what is the concentration in ppm?
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Answer and explanation
Correct answer: 4 ppm
For very dilute aqueous solutions, 1 L water is approximately 1 kg and ppm is approximately mg solute per litre of water. Thus 12 mg in 3 L corresponds to 12/3 = 4 mg L−1, or approximately 4 ppm. The approximation relies on water density being close to 1 g mL−1.
Frequently asked questions
What is the correct answer to this question?
4 ppm
Why is this the correct answer?
For very dilute aqueous solutions, 1 L water is approximately 1 kg and ppm is approximately mg solute per litre of water. Thus 12 mg in 3 L corresponds to 12/3 = 4 mg L−1, or approximately 4 ppm. The approximation relies on water density being close to 1 g mL−1.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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