Q: How long should I dry the liquid or solution?

A: If using magnesium sulfate powder ten or fifteen minutes should suffice. For calcium chloride pellets wait overnight.

Q: What is the distinction between a liquid and a solution?

A: In general, a liquid would indicate a single compound whereas a solution is a liquid with something else dissolved in it (the solute - which could be a solid, liquid or gas in its pure state). The techniques for drying solutions and pure liquids are generally the same.

Q: How can I tell when I have added enough magnesium sulfate powder?

A: The hydrate which forms upon reaction with water is "clumpy." Add the magnesium sulfate in small "spatula-tip" portions. As you swirl the suspension during addition, you will see the solid clump up, but after the water is mostly adsorbed the additional mag sulfate does not clump - it is like doing a titration. [Note: the clumps which have already formed will not disappear]. Add just a bit more, then let the mixture stand. Gravity filtration to remove the hydrated drying agent is considered a part of the drying process.

©2001,2002 Daniel A. Straus