Which condition did you change?
Labs / Chemistry
Buffer Lab
Two beakers, one buffer and one of plain water, sit side by side. Each drop of strong acid or base falls into both at once — watch the water swing wildly while the buffer barely flinches. The readouts track pH, the conjugate ratio [A−]/[HA], and how much buffering capacity is left.
Buffer Lab
Two beakers, one buffer and one of plain water, sit side by side. Each drop of strong acid or base falls into both at once — watch the water swing wildly while the buffer barely flinches. The readouts track pH, the conjugate ratio [A−]/[HA], and how much buffering capacity is left.
Why it matters
Why explore this?
Chemistry connects events too small to see with changes we can measure. This model helps you link particles, energy, and conditions to an observable result.
Explore
Try the model
buffer —[A⁻]/[HA] —capacity —water —
Investigate
Questions to test
Predict first, try it in the model, then use what you observe to answer.
What to try
- After one acid drop, why does the water plunge toward pH 3 while the buffer hardly moves at all?
- Keep adding acid. What happens to the buffer the moment its capacity readout reaches 0 %?
- When the conjugate ratio [A−]/[HA] is exactly 1 : 1, how does the buffer's pH compare to its pKa?
- Switch from Acetate to Ammonium. Why does the buffer now hold a completely different pH with the same 50/50 mix?
- Does a bigger drop size break the buffer faster, or does it only change how many drops it takes?
Explain
Make sense of what happened
Describe what happened at the particle or energy level, then connect it to the result you saw. A strong explanation names both the cause and the evidence.
Check
Before you leave
What happened to the particles or energy?
What observation supports your explanation?
If you can answer all three using evidence from the model, you understand the main idea. If not, return to Explore and change one setting at a time.