In science class, we were creating mixtures of salt, sand and rocks. We studied the mixtures with worksheets and diagrams and then we collected information. Then the entire class discussed their various ideas of filtration to separate the sand, salt, and rock mixture. There were ideas like anti-centrifugal force, the fan idea (the different masses separated by wind), and the fish tank idea (different levels of filters).FUN FACT: Salt is less dense than sand.
The next day we actually built a filtration system, and used it. Water was poured and the rocks were caught in a large mesh. The sand seeped through and got stuck in a coffee filter, while the salt landed in a beaker with the water. Then we evaporated the water to leave the salt behind.
Question & Answer
Why did the salt stay behind instead of evaporating?
Because the salt is too heavy to evaporate, it stays behind in its solid state.
Has all of the salt been isolated after the evaporation of the water?
No, probably not. Some salt may have gotten caught in other parts of the filtration system and stayed mixed with the sand or rocks.
By: R & K
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