Put 10 mL of water in a test-tube. Read the temperature of the water. Dissolve about 2 g of
potassium nitrate in the water. The temperature should fall through 90oC. This means that,
in the process of dissolving in the water, the particles have absorbed energy. This energy
has been taken from the surrounding water in the form of heat. A similar result can be
obtained by using potassium chloride instead.
sharon kalunda answered the question on April 12, 2019 at 08:55
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