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Endothermic and Exothermic Reaction

Why the tempe...

Question

Why the temperature of the mixture of HCl rises when aluminium is added to it.

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Solution

The reaction of Al with dil. HCl is exothermic, i.e. heat is produced in the reaction, hence the temperature of the reaction mixture rises.

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Q. During the reaction of some metals with dilute hydrochloric acid, the following observations were made. The temperature of the reaction mixture rises when aluminium (Al) is added mainly because :

Q. When a solution of

500 m L

2 M

K O H

500 m L

2 M

H C l

, then the rise temperature

T_{1}

is noted. When the same experiment is repeated by mixing

250 m L

of each solution, the rise in temperature

T_{2}

Q. A solution of 200 mL of 1 M KOH is added to 200 mL of 1 M HCl and the mixture after attaining reaction equilibrium shows a rise in temperature by

△ T_{1} .

The experiment is repeated by using 50 mL of 1 M KOH and 50 mL 1 M HCl which at equilibrium shows a rise in temperature by

△ T_{2} .

Q. A solution of

500 m l

2 M K O H

500 m l

2 M H C l

and the mixture is well shaken. A rise in temperature,

T_{1}

is noted. The experiment is again performed using

250 m l

K O H

250 m l

H C l

solution and rise in temperature

T_{2}

is again noted. Which of the following is correct?

Q. A solution is 500 mL of 2 M

K O H

is added to 500 mL of 2 M

H C l

and the mixture is well shaken. The rise in temperature

T_{1}

is noted. The experiment is then repeated using 250 mL of each solution and rise in temperature

T_{2}

is again noted. Assume all heat is taken by the solution.

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