Use one compact chemistry branch where concentration, solubility, acid-base balance, buffers, and pH all stay attached to the same bounded solution story.
This topic broadens Chemistry beyond the rates-and-equilibrium pilot without inventing a giant chemistry engine. Concentration and Dilution keeps amount and volume visible together in one beaker, Solubility and Saturation adds the current dissolving limit and visible excess solid to that same beaker, Acid-Base / pH Intuition reuses the solution-first language for acid-base balance, and Buffers and Neutralization keeps the pH strip and reserve story attached to the same bounded mixture.
Best first concepts
The topic page keeps these starts in their own compact row so the first screen is about orientation and next action, not stacked feature cards.
Use one beaker to separate how concentration changes when you add solvent from how it changes when you add more solute.
How crowded the solution is
Strong first stop for getting into this topic without scanning the whole library.
Keep dissolved amount, excess solid, and current capacity in one beaker so saturation reads like a visible limit instead of a slogan.
Dissolving limits
Strong first stop for getting into this topic without scanning the whole library.
Keep acid amount, base amount, water, and the pH strip visible together so acidity and basicity stay intuitive rather than memorized.
Acid-base balance
Strong first stop for getting into this topic without scanning the whole library.
Keep neutralization, buffer reserve, and the pH strip visible together so steady pH does not look like unchanged chemistry.
Buffer reserve and neutralization
Strong first stop for getting into this topic without scanning the whole library.
Specific learning goals
These goal cards stay authored and transparent. They reuse the current topic page, starter tracks, guided collections, concept bundles, and progress cues instead of adding a separate recommendation system on top of this branch.
Use the solutions-and-pH topic route, the new Solutions and pH Lesson Set, the starter track, and the rates-and-equilibrium topic page so Chemistry feels broader without becoming sprawling.
Primary move
Open topic route
No saved progress yet inside Solutions and pH.
Entry diagnostic
Start from the opening step
No saved diagnostic checks are available yet, so the opening step is still the best entry into the collection.
Reuses the guided collection entry for Solutions and pH Lesson Set, with 0 of 2 probes already ready.
No saved progress yet inside Solutions and pH.
Open the solutions-and-pH topic route is the next guided collection step.
Concentration and Dilution opens this track and sets up the rest of the path.
No saved progress yet inside Rates and Equilibrium.
Grouped concept overview
Each group is authored in the topic catalog, but the actual concepts, progress badges, and track cues still come from the canonical concept metadata and shared progress model.
Group 01
Start with one beaker where amount, volume, and the dissolving limit can all be changed honestly, so dilution and saturation do not collapse into the same story.
用同一個燒杯分清加入溶劑時濃度如何改變，以及加入更多溶質時濃度又如何不同地改變。
Strong first stop for getting into this topic without scanning the whole library.
把已溶解量、剩餘固體與當前容量都放在同一個燒杯裡，讓飽和讀起來像一個看得見的極限而不是口號。
Strong first stop for getting into this topic without scanning the whole library.
Group 02
Carry the same solution language into a pH story where acid character, base character, water, and buffer reserve all push on the same bounded system.
把酸量、鹼量、水與 pH 試紙一起顯示，讓酸性與鹼性保持直觀而不只是背誦。
Strong first stop for getting into this topic without scanning the whole library.
把中和反應、緩衝儲備與 pH 試紙一起放在視野中，讓 pH 穩定不再看起來像化學沒有發生變化。
Strong first stop for getting into this topic without scanning the whole library.