they dissolve differently. 5. As a demonstration, have students add salt, sugar, and alum to dirty water to show that alum cleans water more effectively than salt or sugar. Alum has an interesting ...

But what a marvel it is! It is the “universal solvent” because it is able to dissolve so many different substances. It is also one of the few substances that exist in all three phases on the earth.

Heat can help some substances dissolve faster in water. Salt, for example, will dissolve quicker in hot water than in cold water. When a substance dissolves, it might look like it has disappeared ...