the saturated shown above is left uncovered on a lab bench at a constant temperature. as the solution evaporates, samples of the solution are removed every three days and the in the samples is measured. it is observed that the in the solution did not change over time. which of the following best helps to explain the observation? (a) as the solution evaporates, and leave the beaker along with the water molecules. (b) as the solution evaporates, the dissolution of in the beaker decreases. (c) the evaporation of water is endothermic, so more dissolves exothermically in the solution, which increases the . (d) as water evaporates, more precipitates out of the solution in the beaker.