Question

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PRE-LAB If you were to plot temperature (C) vs. time (minutes) for the following scenario, what would the general profile look like? What important information can be gleaned from your plot? 1) Solute "blue" is dissolved in a beaker of water at room temperature. 2) Room temperature is 22°C 3) 4) Solute "blue" takes about 3 minutes to dissolve. Upon dissolving the beaker warms up...to about 27°C. 5) The beaker containing the solution is then placed in ice and cooled for 10 minutes, at which point you notice that the temperature is -4°C and remains at that temperature for several more minutes. Make a rough sketch/plot of the data reflected in points 1-5 above. This has been started for you as reflected in the template plot to the right. Make this plot in your lab notebook. This must be completed before you arrive to lab. Time There are two important portions of your plot to recognize and identify: 1) 2) Place an "X" on the portion of the plot that reflects the heat required/released upon the solute dissolving. Use an arrow to indicate the place on the plot that reflects a permanent property (temperature) change.

Answer 1

1) Solute blue" is dissolved in a beaker of water at room temperature. 22) Roomtemperature is 22 C. 33) Solute blue"takes about 3 minutes to dissove 44) Upan dissolving the beaker warms up. .to about 27C 55) The beaker containing the solution is then placed in ice and cooled for 30 4 25 3 22-- 10 minutes, at which point you notice that the temperature is 4°Cand remains at that temperature for several more minutes. 20 X Heat released during solvation of solute 15 101 14 16 Time (min) 13 Freezing point of solution (Permanent property)