Discussion
Consider the following statements about concentration in dilute aqueous solution.
1. Milligrams per litre and parts per million are nearly equal.
2. The approximation relies on the density being close to one kilogram per litre.
3. The same equality holds for a concentrated brine.
Answer: A
The first two are correct and the second explains the first. The third fails because a concentrated brine is appreciably denser than water, so the two measures diverge. The correction is simply the ratio of the densities.
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