How would you get a pure sample of dry salt from rock salt?

Answer 1

Firstly you grind the rock salt with a pestle.

Then you start to dissolve the salt. After that you filter it.

Last but not least we allow the water to evapourate.

In the evapourating basin there should be pure salt left over.

Add. In rock salt, there will be other contaminants such as magnesium and calcium salts. These have different solubilities, and careful decanting is needed to decant the (say) Mg rich liquid, leaving the Na material behind.

But this is the way it is done at the salt works.

Answer 2

1. Rock Salt (a mixture of salt, sand and dirt) is crushed into small pieces.
2. Water is added to this mixture.
3. The mixture is warmed and stirred.
4. Only the pure salt dissolves.
5. The mixture is filtered.
6. The salt solution passes through filter paper.
7. The sand and dirt are trapped in the filter paper.
8. The solution is evaporated gently to leave dry salt.

Answer 3

First you get the sea water and boil it vigourously for 30 minutes to kill micro-organisms and also reduce the volume thus concentrating the salt. Then you allow to cool and filter it through filter paper with very fine pores (1 micrometer). following that, allow the water to evaporate. When most of the water has evaporated, spread the residue (salt) out onto a sheet of black plastic and allow to dry in direct sunlight. Grind up the resultant sea salt. Be aware that the salt prepared in this way is not purified and will also contain all other minerals and chemicals that the water contained, but these are generally very low.

Answer 4

To get a pure sample of dry salt from rock salt, you can dissolve the rock salt in water, filter out any impurities, then evaporate the water to leave behind the pure salt crystals. Alternatively, you can use a process like recrystallization to separate the salt from impurities in the rock salt sample.

Answer 5

The rock salt is grinded, dissolved in water, the solution is filtered and refined by repeated processes of crystallization/recrystallization.

Answer 6

you would put the sand salt into the water. then once the salt has dissolved sive the water into another container to evaporate. once the water has evaporated you will be left with salt.

Answer 7

Make a water solution and filter; the sodium chloride solution passes the filter, the sand remain on the filter.