E-CodeWeak-acid titration and buffer pH — a TI-84 Plus CE program
ACIDBASE is a TI-BASIC program for the TI-84 Plus CE. pH at any point of a weak acid + NaOH titration (start, buffer region, equivalence, excess base) with the equivalence volume, or the pH of an HA/A- buffer — both from the exact charge balance, with Henderson-Hasselbalch alongside.
What it asks for and what it shows
It asks for 5 values at its prompts, after you pick option 1 from its menu. In the example below it shows PH, POH, PKA, VEQ ML, START: WEAK ACID.
Example run
One of its oracle test cases: “acetic acid, before any base”. 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 | 1.8ᴇ⁻5 |
| Input 2 | 0.1 |
| Input 3 | 25 |
| Input 4 | 0.1 |
| Input 5 | 0 |
| The screen shows | |
PH= | 2.87527706 |
POH= | 11.12472294 |
PKA= | 4.744727495 |
VEQ ML= | 25 |
| Text | START: WEAK ACID |
How it's checked
7 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 43 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 “Weak-acid titration and buffer pH” (ACIDBASE).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- Weak acid equilibrium pH
- Ideal gas law solver
- Limiting reagent and theoretical yield
- ICE table: equilibrium concentrations
- Rate laws: zero, first and second order
All TI-84 Plus CE chemistry programs · All TI-84 Plus CE programs