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Timmy is making a 4 M HCl solution in a 1 L volumetric flask. The dilution...

Timmy is making a 4 M HCl solution in a 1 L volumetric flask. The dilution is quite exothermic. He fails to wait for the solution to cool before making it up to the mark. How would this effect the concentration of the resultant solution? Explain.

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Answer #1

When the 4M HCl solution is diluted that is water is added heat is evolved since the reaction is exothermic, due to which some amount of water is evaporated thus, when the solution is cooled down the net result is decrease in the volume of the resultant solution. And, from the relation

N1V1 = N2V2

it can be seen that volume is inversely proportional to the concentration. Since the final volume is decreased therefore, concentration of the resultant solution will increase.

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