Final answer:
A method for separating pure salt from a rock salt mixture is through the process of evaporation.
Step-by-step explanation:
A method for separating pure salt from a rock salt mixture is by using the process of evaporation. First, the rock salt mixture is dissolved in water to form a saltwater solution. Then, the solution is heated, causing the water to evaporate and leave behind the pure salt crystals. These crystals can be collected and separated from the remaining water.
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