A solution contains 0.02 g solute in 400 g solution. What is its concentration in ppm?
Answer and explanation
Correct answer: 50 ppm
Parts per million by mass is calculated as (mass of solute/mass of solution) × 10⁶. Substitution gives (0.02/400) × 1,000,000 = 50 ppm. The denominator is the total solution mass because the question gives concentration in the solution. ppm is especially useful for expressing very small solute amounts or trace impurities.
Frequently asked questions
What is the correct answer to this question?
50 ppm
Why is this the correct answer?
Parts per million by mass is calculated as (mass of solute/mass of solution) × 10⁶. Substitution gives (0.02/400) × 1,000,000 = 50 ppm. The denominator is the total solution mass because the question gives concentration in the solution. ppm is especially useful for expressing very small solute amounts or trace impurities.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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