Place a pinch of Sodium chloride on a teaspoon. Heat and note the time it takes to melt it. If after 3 minutes of heating, the substance does not melt, stop the heating
Boiling water (70 degrees) - fully dissolved in the 2 minute period. Ice cold water (3 degrees) - the salt crystals shrunk to half the size but did not dissolve
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Boiling water (70 degrees) - fully dissolved in the 2 minute period. Ice cold water (3 degrees) - the salt crystals shrunk to half the size but did not dissolve