You are asked to separate sand and sodium chloride. Name the methods needed to carry out the procedure. Explain how you would carry out the procedure to obtain pure sand and sodium chloride back.

Method:-Water dissolution, filtration, and evaporation:

Sodium chloride is easily soluble in water, while sand does not dissolve in water. To separate out sodium chloride from sand, one can dissolve the mixture of sodium chloride and sand in water. Heating and stirring will speed up the process of sodium chloride dissolution in water. The sand will settle down at the bottom of the container and can be filtered out from the liquid phase, using a filter paper, piece of cloth, etc. Finally, the sodium chloride can be obtained by evaporating the water from the liquid phase (water containing sodium chloride in it) by boiling it at 100 degrees Celsius. 

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Qand k are only the same when the forward rate of the reaction has reached zero.