QC & Troubleshooting Scenarios
Real buffers misbehave: the pH drifts in the cold room, a solution turns cloudy, an electrode reads a wrong slope. In this exercise you work through one lab scenario at a time. Read the symptom and the given data, pick the best diagnosis, then check the explanation and follow the link to the experiment where you can explore it hands-on. Aim to reason from the chemistry, not from memory.
Scenario 1 of 7
Score: 0 / 0
These scenarios are simplified for teaching. The underlying models treat
activity ≈ concentration (ionic strength is ignored) and represent polyprotic
buffers by a single relevant pKa, so exact numbers in a real lab can differ.
Always confirm against the bottle label, your meter, and your own measurements.