Explore the Chemical Equilibrium Simulator
Watch the forward and reverse reactions balance and apply Le Chatelier's principle. Free, no signup, runs in your browser.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
The Chemical Equilibrium Simulator with sample data entered and the result showing.
What is the Chemical Equilibrium Simulator?
Watch the forward and reverse reactions balance and apply Le Chatelier's principle. It runs in your browser, so a change to a setting or a drag on an object shows up at once.
Equilibrium controls ammonia production for fertiliser, blood buffering in your body and ocean chemistry.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
At equilibrium the forward and reverse rates are equal, but the reactions never stop.
Adding reactant pushes the system toward products, and removing product does the same.
K = [B] / [A] at equilibrium tells you which side is favoured.
Add 40 A and watch the shift.
Remove product.
Change kf and kr.
Used for
Pick one to see how it fits.
Reactions & Kinetics learners
Students learning reaction rates, equilibrium and equations, and teachers who want a visual way to explain what happens to particles.
Try it freeTeachers
For teachers: project the Chemical Equilibrium Simulator on the board, let students predict the result, then run it together and test this: Remove product. For students: change one thing at a time and write down what changes.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This simulation | Textbook diagram | |
|---|---|---|
| Interactive | Drag, tap and change settings | Fixed picture |
| Install | Nothing to install | Not needed |
| Cost | Free to use | Depends on the book |
Questions people ask
Does the reaction stop at equilibrium?
No. Both reactions carry on at the same rate, so the amounts stay constant. This is called dynamic equilibrium.
What does Le Chatelier's principle say?
If you disturb a system at equilibrium, it shifts in the direction that partly counteracts the disturbance.
Is the Chemical Equilibrium Simulator free to use?
Yes. The Chemical Equilibrium Simulator is free, needs no signup or download and runs in your web browser. It is part of the Reactions & Kinetics group of AZRS simulations.
Does the Chemical Equilibrium Simulator work on a phone or tablet?
Yes. The Chemical Equilibrium Simulator takes touch input as well as mouse input, so you can use its 3 adjustable settings with a finger. A larger screen makes the controls and graphs easier to read.
How do I use the Chemical Equilibrium Simulator?
1. In the Chemical Equilibrium Simulator, use the controls to change Forward rate constant kf, Reverse rate constant kr, Disturb the system. The simulation reacts instantly. 2. In the Chemical Equilibrium Simulator, press "+ 40 A", "+ 40 B", "− 40 B", "Restart" to start, reset or change what is happening. 3. Start with this experiment: Add 40 A and watch the shift. Drag any glowing handle, object or slider with your mouse or finger and the Chemical Equilibrium Simulator responds in real time. 4. Change one setting at a time and watch which readout moves, then compare it with this idea: At equilibrium the forward and reverse rates are equal, but the reactions never stop.
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Try the Chemical Equilibrium Simulator now
Watch the forward and reverse reactions balance and apply Le Chatelier's principle. Free to use.
Try it free