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Follow the authored sequence, or switch to recap mode for a faster review of the same path.

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Starter track4 concepts4 checkpointsChemistry95 min

Solutions and pH

Not started

Start with concentration in one beaker, add solubility limits and saturation, then reuse that same solution language to read pH, buffers, and neutralization.

Use this track when Chemistry should feel broader than the original rates-and-equilibrium slice without turning into a giant curriculum tree. The path starts with how much solute sits in how much liquid, then adds the dissolving limit and visible excess solid before widening into pH, buffers, and neutralization on the same bounded solution model.

Amount in volumeDilution without losing soluteSolubility limit and excess solidpH as a live scaleBuffer reserve and neutralization

Entry diagnostic

Decide where to enter this path without opening a second testing system.

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.

Start from beginning0 / 2 probes ready

Check the solution-foundations bridge first

Start from beginning

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.

Begin with Concentration and Dilution
  1. Quick testNot started2 questions

    Concentration quick test

    Check whether amount-versus-volume reasoning and dilution already stay separate on the same beaker.

    No saved quick-test result yet.

    Concentration
    Open Concentration and Dilution quick test
  2. ChallengeNot started6 checks

    Saturation checkpoint

    Use the saturation challenge to verify that dissolving capacity and visible excess already read cleanly before you skip the opening solution concepts.

    No saved checkpoint attempt yet.

    Solubility
    Open Dissolve the excess without removing solute

Why this order

The sequence is authored to keep the model honest.

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

Each step opens the same simulation-first framework.

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

Follow the concepts and checkpoint moments in order.

Checkpoint cards reuse the authored challenge entries already living on the concept pages.

  1. 1Not startedMastery: NewStart here

    Concentration and Dilution

    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.

    Solutions and pHIntro22 min
    Start concept
  2. Checkpoint 1LockedNot started

    Dilution checkpoint

    Lock in a genuine dilution move where the beaker becomes less concentrated without turning it into a different solute case.

    Finish Concentration and Dilution first. This checkpoint ties together Concentration through Dilute without losing solute.

    Pause here after Concentration and Dilution before moving into Solubility and Saturation.

    Concentration6 checksCoreGraph-linkedGuided start
    Return to ConcentrationOpen concept
  3. 2Not startedMastery: New

    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.

    Solutions and pHIntro24 min
    Open concept
  4. Checkpoint 2LockedNot started

    Saturation checkpoint

    Lock in the idea that the same solute can hit a real dissolving limit, so extra solid appears unless you increase the capacity.

    Finish Solubility and Saturation first. This checkpoint ties together Concentration and Solubility through Dissolve the excess without removing solute.

    Pause here after Solubility and Saturation before moving into Acid-Base / pH Intuition.

    ConcentrationSolubility6 checksCoreGraph-linkedGuided start
    Return to SolubilityOpen concept
  5. 3Not startedMastery: New

    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.

    Solutions and pHIntro24 min
    Open concept
  6. Checkpoint 3LockedNot started

    Near-neutral checkpoint

    Finish by landing the mixture near neutral while acid and base character stay visibly close together on the same pH bench.

    Finish Acid-Base / pH Intuition first. This checkpoint ties together Concentration, Solubility, and pH intuition through Land near neutral.

    Pause here after Acid-Base / pH Intuition before moving into Buffers and Neutralization.

    ConcentrationSolubilitypH intuition6 checksCoreGraph-linkedGuided start
    Return to pH intuitionOpen concept
  7. 4Not startedMastery: New

    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.

    Solutions and pHIntro25 min
    Open concept
  8. Checkpoint 4LockedNot started

    Buffer checkpoint

    Close the track by keeping the pH near neutral under an acid pulse while the reserve bar still shows that the chemistry is being used.

    Finish Buffers and Neutralization first. This checkpoint ties together pH intuition and Buffers through Hold near neutral under an acid pulse.

    Final checkpoint that closes the authored track after Buffers and Neutralization.

    pH intuitionBuffers10 checksCoreGraph-linkedGuided start
    Return to BuffersOpen concept