1. Concentration and Dilution2. Solubility and Saturation3. Acid-Base / pH Intuition4. Buffers and Neutralization
This concept is the track start.
Concept module
Concentration and Dilution
Use one beaker to separate how concentration changes when you add solvent from how it changes when you add more solute.
Interactive lab
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Why it behaves this way
Explanation
Concentration becomes easier to trust when the amount of solute and the amount of liquid stay visible together. This bench keeps one vessel, a concentration readout, and a particle view in the same frame so crowding and dilution do not turn into slogans.
The key distinction is that adding solvent changes concentration without adding solute, while adding solute changes concentration in a different way.
Key ideas
01Concentration is about how much solute is present in how much liquid.
02Dilution lowers concentration by increasing the amount of liquid while keeping the solute amount the same.
03Adding solute and adding solvent can both change concentration, but for different reasons.
Frozen walkthrough
Step through the frozen example
Frozen walkthrough
Use the current beaker state rather than a detached ratio problem.
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View plansFrozen valuesUsing frozen parameters
For the current mixture, how concentrated is the beaker?
Solute amount
8
Solvent volume
1.4
1. Read how much solute is present
The beaker currently holds 8 units of solute.
2. Read how much liquid is present
The same solute is spread through 1.4 units of solvent.
3. Read the concentration and density cue together
That gives a concentration of about 5.71, with roughly 29 visible particles in the beaker.
Current concentration
With less liquid in the beaker, the same solute occupies a tighter space and the concentration rises.
Common misconception
If the beaker looks fuller, that must mean there is more solute in it.
A fuller beaker can simply mean there is more solvent present.
Dilution changes concentration even when the solute amount does not change.
Mini challenge
Make the beaker clearly less concentrated without removing any solute.
Make a prediction before you reveal the next step.
Decide whether to change the amount of solute, the amount of solvent, or both before you try it.
Check your reasoning against the live bench.
You need to add solvent while keeping the solute amount fixed.
That is the cleanest way to model dilution rather than simply making a different mixture.
Quick test
Misconception check
Question 1 of 2
Answer from the live beaker story, not from a memorized slogan.
What is the cleanest description of dilution on this bench?
Use the live bench to test the result before moving on.
Accessibility
The simulation shows a beaker with dissolved particles, a concentration readout, and controls for solute amount and solvent volume.
Graph summary
One graph shows how concentration changes with solvent volume, and a second shows how concentration changes with solute amount.
Read next
Keep this idea moving
Open the next concept, route, or track only when you want the current model to widen into a larger branch.
Carry the same beaker story into dissolving limits and visible saturationSolutions and pH
Solubility and Saturation
Keep dissolved amount, excess solid, and current capacity in one beaker so saturation reads like a visible limit instead of a slogan.
Builds on thisSolutions and pH
Acid-Base / pH Intuition
Keep acid amount, base amount, water, and the pH strip visible together so acidity and basicity stay intuitive rather than memorized.
Next in Buffer reserve and neutralizationSolutions and pH
Buffers and Neutralization
Keep neutralization, buffer reserve, and the pH strip visible together so steady pH does not look like unchanged chemistry.