Press the 'Pause/Resume' button at any time to pause or resume particle movement.
Adjust the 'Acid concentration' slider below the particle box to change the number of acid particles that spawn.
Adjust the 'Acid strength' slider below the particle box to change the strength of the acid: 100% means all acid molecules are dissociated into H+ and A- ions, 1% means only 1% are.
Check the readout above the particle box to see:
The number of H+ ions
pH
A bar chart showing the number of HA molecules, the number of A- ions and the number of H+ ions.
Toggle the 'Number of containers' toggle between 1 and 2, 2 being useful for a side-by-side comparison.
Toggle 'Highlight H+' to more clearly show the difference in H+ concentration as you change the settings.
Toggle 'Reaction mode' to add the ability to add reactant particles and explore the effect of acid concentration and strength on the rate of reaction.
In the 'Reactant type' drop-down, choose between 'Permanent' and 'Consumable':
In 'Permanent' mode, the reactants don't get consumed but simply flash each time they collide with an H+, this is useful to see the effect of concentration and acid strength on the rate of reaction. Check the readout next to pH to see the reaction rate.
In 'Consumable' mode, the reactants get consumed when they collide with an H+ ion, this is useful to demonstrate how weak acids will react with the same amount of substance as strong ones, just more slowly (consumed H+ from weak acids are replaced by HA dissociating). Check the readout next to pH to see how many reactants have been consumed.
Adjust the 'Set reactant quantity' slider to choose how many reactant particles to add.
Click the 'Add reactant particles' button to add the chosen number of particles and begin the reaction, then press the 'Reset' button to reset it.