The Vanishing Sting

the flask turns colour before it is actually neutral.

drip base into acid — watch pH creep, then jump

PH barely moves for most of the drops going in, then jumps almost the entire scale in just a handful right near the equivalence point — the flat stretch is easy to mistake for nothing happening. The flask’s color change isn’t the same event as true neutrality; it only reports when the particular dye in it crosses its own transition window, which can sit off from equivalence entirely.

Concepts: chemistry, measurement.

An interactive you play with one thumb, on Wundr.