Salt is soluble in water whereas sand is insoluble in water. This difference in solubility of salt and sand in water is used to separate them. The mixture of salt and sand is taken in a beaker and water is added to it. The mixture is stirred to dissolve the salt in water. The sand remains undissolved. The salt solution containing sand is filtered by pouring over a filter paper kept in a funnel. Sand remains as a residue on the filter paper and salt solution is obtained as a filtrate in a beaker kept below the funnel.