When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is Saturated.
Solution is saturated which means no more solute can be dissolved in the solvent at the given/present temperature and pressure conditions. To dissolve more sugar in the tea we need to increase the temperature of the tea so that the tea becomes unsaturated, for the given conditions also the solubility of the solids increases with the increase in the temperature, so more of the sugar can be dissolved if the temperature of the solvent is increased.
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