Generally, the quantity of a solute that can be dissolved in a solvent increases with temperature
The reason why Emma cannot get all the sugar to dissolve in the ice tea is as follows;
The liquid in the iced tea, which is the solvent has reached its solubility limit, it is saturated and therefore can not dissolve any more sugar at the given temperature
Solubility limit and saturation point clarification:
The saturation point or solubility limit is the point at which the sugar in the
solution has the same chemical potential as is present in pure sugar
In order to dissolve more sugar, the temperature of the solution needs to
be raised to increase the kinetic energy of the solvent and sugar molecules
such that the bonds holding the sugar molecules can disintegrate and
more sugar is then dissolved making the iced tea sweeter
Learn more about solid solubility here;
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