Users' Guide User guide

112 Melting Point Depression

Procedure

1. Remove the frozen solutions from the freezer.

2. Connect the temperature probes.

a) Connect the temperature probe measuring the pure water ice to Temper-

ature Port 1 on the left side of the GLX.

b) Connect the other probe to Temperature Port 2.

3. Press to start data collection.

4. Set up the Graph to display both temperature measurements.

a) Press to return to the Home Screen; press to open the Graph.

b) Press to open the Graphs menu; press to select Two Measure-

ments mode.

c) Press to automatically scale the Graph.

5. Continue data collection until both solutions have reached 5 °C. Press

to stop data collection.

Analysis

Describe the temperature versus time plots of both solutions. How are they simi-

lar? How do they differ? Which solution melts at a lower temperature?

Graph in Two Measurements mode

displaying both temperatures

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