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2. When 4.98 g of NaOH was dissolved in 49.72 g of water in a calorimeter...

2. When 4.98 g of NaOH was dissolved in 49.72 g of water in a calorimeter at 23.7*C, the temperature of the solution went up to 50.1*C.

a) Is this dissolution reaction exothermic? ______ Why?

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ANSWER : Is this dissolution reaction is exothermic ? YES

Before reaction temperature of water is 23.7 0 C. When NaOH is added to the water , dissolution reaction takes place and temperature of water increases from 23.7 0 C to 50.1 0 C. In this process, temperature of water increases means water absorbs heat released in the dissolution reaction. We know that, exothermic reaction is a reaction in which heat is released.

Dissolution of NaOH in water releases heat and hence it is exothermic reaction.

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