E-CodeBoiling point elevation, freezing point depression — a TI-84 Plus CE program
COLLIG is a TI-BASIC program for the TI-84 Plus CE. Grams of solute, its molar mass, kilograms of solvent and the van 't Hoff factor: molality, the boiling-point rise and freezing-point drop, and the new boiling and freezing points (water, or your own Kb and Kf).
What it asks for and what it shows
It asks for 4 values at its prompts, after you pick option 1 from its menu. In the example below it shows MOLAL, DTB (C), DTF (C), BP (C), FP (C).
Example run
One of its oracle test cases: “1 m NaCl in water (i = 2)”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Menu | option 1 |
| Input 1 | 58.44 |
| Input 2 | 58.44 |
| Input 3 | 1 |
| Input 4 | 2 |
| The screen shows | |
MOLAL= | 1 |
DTB (C)= | 1.024 |
DTF (C)= | 3.72 |
BP (C)= | 101.024 |
FP (C)= | -3.72 |
How it's checked
6 test cases, each checked against the textbook formula it uses. Replayed key by key on a virtual TI-84 Plus CE, they make 38 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Boiling point elevation, freezing point depression” (COLLIG).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
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- Weak-acid titration and buffer pH
All TI-84 Plus CE chemistry programs · All TI-84 Plus CE programs