Experiment on Changing Temperature Effect of Temperature on Solubility of a Salt an

Introduction This experiment examined the effects of changing temperature on the amount of solute that would dissolve in a given amount of water. Water solubility is defined as the mass of solute that will dissolve in 100g water at a given temperature. Different quantities of potassium nitrate, KNO3, were dissolved in the same volume of water at a high temperature. As each solution cooled, the temperature was monitored with a Temperature Probe and the precise moment at which crystals started to form was noted. This is the point at which the solution is saturated and contains the maximum amount of solute at that temperature. Each data pair consists of a solubility value (g of solute per 100 g H2O) and a corresponding temperature. A solubility curve was plotted using the T1 calculator. When saturation exists, equilibrium also exists, and there is dynamic equilibrium between the dissolved and undissolved solute, expressed as

LabPro or CBL 2 interface 400-mL beaker

T1 Graphic Calculator 10-mL graduated cylinder

four 20 x 150-mm test tubes 2 utility clamps

hot plate potassium nitrate, KNO3

1. Goggles were worn for this experiment.

2. Four test tubes were labeled 1-4, and into each tube the amounts of solid show

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ir was collected, STD was pressed to stop data collection. 13. The first solution was poured into a 100-mL graduated cylinder and the volume of the solution recorded. The solution was discarded, the cylinder cleaned and the procedure repeated for each of the other tubes. 14. The data points along the curve on the displayed graph were examined. As the cursor was moved, the solubility (x) and temperature (y) values of each data point were displayed below the graph. The temperature values were recorded in the data table, rounded to the nearest 0.1oC. 15. The data was transferred to Graphical Analysis on the computer by graph link and a graph of solubility (y-axis) vs. temperature (x-axis) was prepared. The temperature was scaled from 0 to 100oC in increments of 10oC, and the solubility was scaled from 0 to 200 g in increments of 10 g. 16. Data was selected from the drop down menu in the data table, new calculated column. "Temperature" was selected in the variable box, and in the equation box, after "temperature" "+273" was entered. The name and label were entered. 17. The molarity of each sample was calculated and entered in a new column in the data table. Data Table Trial Solubility (g/100g H2O) Tem
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