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Saturation and Different Quantities of Water
Reffy, Table G (p. 3) shows the solubility in 100 grams of water.
Sometimes the question will ask about the solubility in different quantities of water. So you will need to adjust your answer according to the quantity of water given.
How much SO2 will be dissolved in 200 grams of water at 50°C?
1. Find the saturation point as you would for 100 grams of water. (See previous card.)
• Find 50°C on the bottom of the table. Follow the 50°C line up until you hit SO2. Follow the point of intersection across the graph to the left. The answer is 4 grams per 100 grams of water.
2. Since the question asks about 200 grams of water, we just double our answer. 4 x 2 = 8 grams
How much SO2 will be dissolved in 50 grams of water at 50°C?
1. Find the saturation point as you would for 100 grams of water. The saturation point is 4 grams. 2. Since the question asks about 50 grams, divide your answer in half.
4 = 2 grams 2
UNIT 7: SOLUTIONS / SOLUBILITY © 270
