Answer to Question #59941 in Physical Chemistry for muhammad umar

Question

In order to dissolve the greatest amount of sugar in a cup of water,you should?
A)use sugar crushed into small pieces, and heat the water
B)use sugar crushed into small pieces,and cool the water
C)use sugar in large pieces,and heat the water
D)use sugar in large pieces,and cool the water

Answer 1

To dissolve the greatest amount of sugar in a cup of water, you need to move the reaction equilibrium. According to the Le Chatelier’s principle, the increase in temperature favors the reaction that is endothermic. As in the majority, the reactions of dissolving the solid matter in liquid are endothermic, he ating of the cup will favor the dissolution of sugar. Then, answers A and C are already half-correct.
Concerning the extent of dispersion of sugar (crushed into the small pieces or they put it just in large ones), one should be attentive that this dispersion affects only the kinetics of the processes, not thermodynamics. That means, whether the sugar is in small or big pieces, the
amount of sugar finally dissolved will be the same. However, the small pieces of sugar will dissolve faster.

A and C.