# Calculating volume of water evaporated

A 230mL sample of a 0.276 M CaCl2 solution was left on a hot plate overnight; the following morning, the solution is 1.10 M. What volume of water evaporated from the 0.276 M CaCl2 solution?

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#### Solution Summary

This solution provides a brief explanation for finding moles and using this information to calculate volume.

Residence Time of Water

A stable and highly soluble pollutant is dumped into a lake at the rate

of 0.19 tonnes per day. The lake volume is 2E7 m3 and

the average water flow-through rate is 8E4 m3 per day. Ignore evaporation

from the lake surface and assume the pollutant is uniformly mixed in the lake.

What eventual steady-state concentration will the pollutant reach (in ppm)?

Hint: Calculate residence time of water in lake. Multiply by pollutant input rate.

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