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Dissolve 40 g of sodium hydroxide pellets in water and make up to 500 mL. This is a 2M
solution Also prepare 500 mL of a 2M hydrochloric acid solution. Leave the solutions to cool
to room temperature. Note the actual temperature of the solutions when cool. Then add the
acid to the base quite rapidly and stir with a thermometer. Note the maximum temperature
reached. The increase of temperature should be about 13oC.
(iii) Since the volume of water has been doubled by adding one solution to the other, the
final solution contains 1 mole of OH- (aq) ions which reacted with 1 mole of H+(aq) ions to form 1 mole of water molecules. We must assume that the specific heat of this moderately
weak solution is the same as that of water.
sharon kalunda answered the question on April 12, 2019 at 08:59
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