It is a universal experience on this water planet that some materials seem to disappear when stirred into water. We know from experiment 2-1 that the mass does not change during this process, so apparently the this disappearing materials does not merely vanish, but becomes an invisible part of the liquid.
Purpose: In this experiment we wish to investigate the effect of the amounts of the solvent and solute on the properties of the resulting solution.Materials needed:
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Discussion of Observations and Conclusion: The solute obviously did not vanish, but rather became part of the solution. In the case of a colored solute, the intensity of the color is a property related to what is called the concentration of the solution. What does the uniformity of color tell you about the concentration at different locations in the solution? What do the different intensities of color tell you about how concentration varies depending on amount of solute (compare containers #1, 2 and 4) and the amount of solvent (compare containers #1 and 5)? Account for why containers #1 and 3 have about the same color intensity. Did anything happen in container #4 different than the rest? Why? It is possible for some materials that the concentration of solute exceeds the capacity for the solvent to dissolve it. In such a situation the solution is describes as being saturated.