Weak acid ICE table solver
Run the Weak Acid Solver fullscreen
Edit the MicroSim in the p5.js editor
About this MicroSim
Type in any monoprotic weak acid concentration and \(K_a\), give it an optional label, then click Calculate to render the full ICE table, \(K_a\) expression, and solution steps (including approximation checks and quadratic fallback). A percent-ionization gauge helps students interpret how dilution and \(K_a\) affect ionization.
How to use
- Set the acid name (optional), initial concentration (mol/L), and \(K_a\).
- Click Calculate. The ICE table populates with Initial, Change, and Equilibrium values.
- Review the \(K_a\) expression, approximation verdict, and quadratic solution if needed.
- Read pH, pOH, \([\ce{H^+}]\), \([\ce{OH^-}]\), and percent ionization in the results panel.
- Adjust the inputs to compare different weak acids or concentrations.
Learning goals
| Item | Details |
|---|---|
| Subject area | Chemistry — acid/base equilibrium |
| Grade band | Grades 11–12 and introductory college |
| Learning objective | Students will set up and solve ICE tables for weak acids, deciding whether the small-x approximation is valid. |
| Bloom's level | Apply / Analyze |
| Duration | 12 minutes |
| Prerequisites | Acid dissociation constant (\(K_a\)), ICE tables, logarithms |
| Assessment ideas | Learners screenshot the table and explanation for two acids; exit ticket explains when quadratic solutions are necessary |
Instructional design review
- Single objective: “Use ICE tables to solve weak-acid equilibria.” ✔️
- Controls: three text inputs + a Calculate button; results update only after pressing the button to keep cognitive load low.
- Accessibility: High-contrast table, large fonts, keyboard-friendly inputs.
Lesson plan
- Demo (4 min): Show acetic acid default (0.100 M, \(K_a = 1.8×10^{-5}\)). Point out each ICE row.
- Student practice (6 min): Learners run two acids (e.g., HF and formic acid) to compare pH and % ionization.
- Debrief (2 min): Discuss why dilution increases percent ionization even though total [H⁺] decreases.
References
- Brown, LeMay, Bursten. Chemistry: The Central Science, 15th ed., Pearson, 2022 — Weak acid equilibria.
- Tro, N. J. Chemistry: A Molecular Approach, 5th ed., Pearson, 2020 — ICE table methodology.