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What do you think will happen when the dollar finally collapses? What say you?
Rock salt is sodium chloride mixed with insoluble impurities. In this experiment you will remove these impurities to produce pure sodium chloride.
In addition to the four types of salt seen above, rock salt is very common. It's uses include melting ice on roads and sidewalks and making ice cream. It usually contains many impurities which can negatively affect the taste of foods.