How will u Seperate salt from a mixture of sand, slat and grain
Answers
Answer:
Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.
Answer:
Since both salt and sand are solids, you could get a magnifying glass and tweezers and eventually pick out particles of salt and sand.
Another physical separation method is based on the different densities of salt and sand. The density of salt is 2.16 g/cm³ while the density of sand is 2.65 g/cm³. In other words, sand is slightly heavier than salt. If you shake a pan of salt and sand, the sand will eventually rise to the top. A similar method is used to pan for gold, since gold has a higher density than most other substances and sinks in a mixture.
Separating Salt and Sand Using Solubility
One method of separating salt and sand is based on solubility. If a substance is soluble, it means it dissolves in a solvent. Salt (sodium chloride or NaCl) is an ionic compound that is soluble in water. Sand (mostly silicon dioxide) is not.
Pour the salt and sand mixture into a pan.
Add water. You don't need to add a lot of water. Solubility is a property that is affected by temperature, so more salt dissolves in hot water than cold water. It's okay if the salt doesn't dissolve at this point.
Heat the water until the salt dissolves. If you get to where the water is boiling and there is still solid salt, you can add a bit more water.
Remove the pan from heat and allow it to cool until it's safe to handle.
Pour the salt water into a separate container.
Now collect the sand.
Pour the salt water back into the empty pan.
Heat the salt water until the water boils. Continue boiling it until the water is gone and you're left with the salt.
Another way you can separate the salt water and sand is to stir up the sand/salt water and pour it through a coffee filter to capture the sand.
Separating Mixture Components Using Melting Point
Another method to separate components of a mixture is based on melting point. The melting point of salt is 1474°F (801°C), while that of sand is 3110°F (1710°C). Salt becomes molten at a lower temperature than sand. To separate the components, a mixture of salt and sand is heated above 801°C, yet below 1710°C. The molten salt may be poured off, leaving the sand. Usually, this is not the most practical method of separation because both temperatures are very high. While the collected salt would be pure, some liquid salt would contaminate the sand, like trying to separate sand from water by pouring off water.
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