A water sample contains 0.004 g impurity in 2 kg water. What is the concentration of impurity in ppm?
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Answer and explanation
Correct answer: 2 ppm
Use ppm = mass of impurity/mass of sample × 10^6. The impurity is 0.004 g and 2 kg water is approximately 2000 g. Therefore, ppm = (0.004/2000) × 1,000,000 = 2 ppm. Option B is correct. Converting kilograms and grams to the same unit prevents the common factor-of-1000 error.
Frequently asked questions
What is the correct answer to this question?
2 ppm
Why is this the correct answer?
Use ppm = mass of impurity/mass of sample × 10^6. The impurity is 0.004 g and 2 kg water is approximately 2000 g. Therefore, ppm = (0.004/2000) × 1,000,000 = 2 ppm. Option B is correct. Converting kilograms and grams to the same unit prevents the common factor-of-1000 error.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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