To separate the sand and the salt in the mixture after the salt has been dissolved in water, you can use the following processes:
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Filtration: This process will be used to collect the sand. The sand will remain on the filter paper, while the saltwater solution will pass through.
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Distillation: This process will be used to collect the salt from the saltwater solution. When the solution is heated, the water will evaporate, and the salt will remain as a residue.
Thus, the correct answer is: filtration to collect the sand and distillation to collect the salt.