Starter track
Follow the authored sequence, or switch to recap mode for a faster review of the same path.
Start with concentration in one beaker, add solubility limits and saturation, then reuse that same solution language to read pH, buffers, and neutralization.
Entry diagnostic
Reuse the concentration quick test and the saturation challenge to decide whether to start from dilution basics or jump straight into the pH and buffer end of the track.
Check the solution-foundations bridge first
No saved diagnostic checks are available yet, so the opening concept is still the best place to start.
Uses the same local-first quick tests, checkpoint challenges, and track history already saved in this browser.
Check whether amount-versus-volume reasoning and dilution already stay separate on the same beaker.
No saved quick-test result yet.
Starting from a saturated beaker, make the excess pile disappear while keeping the total solute amount the same.
No saved checkpoint attempt yet.
About this track
Keep the first scan focused on the next lesson. Open the authored rationale and shared-framework notes only when you need them.
Why this order
Concentration and Dilution comes first because it stabilizes the amount-versus-volume story underneath every later solution bench. Solubility and Saturation then adds the idea that the beaker has a real dissolving capacity, Acid-Base / pH Intuition reuses that same solution language for live acid-base balance, and Buffers and Neutralization closes by showing why stable pH does not mean unchanged chemistry.
Shared concept pages
Compare mode, prediction mode, quick test, worked examples, guided overlays, challenge mode, and read-next cues stay on the concept pages. The track only decides the guided order and the next recommended stop.
Guided path
Checkpoint cards reuse the authored challenge entries already living on the concept pages.
Use one beaker to separate how concentration changes when you add solvent from how it changes when you add more solute.
Start here before moving into Solubility and Saturation.
Start from a crowded beaker and make it clearly less concentrated while keeping the solute amount close to the starting value.
Finish Concentration and Dilution first. This checkpoint ties together Concentration through Lower concentration by adding solvent.
Pause here after Concentration and Dilution before moving into 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 Concentration and Dilution before setting up Acid-Base / pH Intuition.
Starting from a saturated beaker, make the excess pile disappear while keeping the total solute amount the same.
Finish Solubility and Saturation first. This checkpoint ties together Concentration and Solubility through Make the excess pile disappear.
Pause here after Solubility and Saturation before moving into 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.
Builds on Solubility and Saturation before setting up Buffers and Neutralization.
Adjust the mixture until the pH sits near neutral and the acid and base bars stay close together.
Finish Acid-Base / pH Intuition first. This checkpoint ties together Concentration, Solubility, and pH intuition through Bring the mixture near neutral.
Pause here after Acid-Base / pH Intuition before moving into Buffers and Neutralization.
Keep neutralization, buffer reserve, and the pH strip visible together so steady pH does not look like unchanged chemistry.
Capstone step after Acid-Base / pH Intuition.
Starting from the unbuffered acid pulse, add enough buffer reserve to bring pH near neutral while keeping the acid and base amounts in place and without relying on lots of extra water.
Finish Buffers and Neutralization first. This checkpoint ties together pH intuition and Buffers through Hold pH near neutral during an acid pulse.
Final checkpoint that closes the authored track after Buffers and Neutralization.
