THE LIBRARY
Every experiment. Read it, or run it.
Full protocols with apparatus lists, safety notes, and the results you should expect — plus a live simulator on the same page, so reading and doing are one trip, not two.
11 of 19 experiments
Titration: ethanoic acid vs sodium hydroxide
Open the tap drop by drop, chase the pink endpoint, and calculate the concentration.
Simple pendulum: measuring g
Time the swing at five lengths and extract g from a T²–L plot.
Double-indicator titration: phosphoric acid against sodium hydroxide
Catch both end-points of a triprotic acid in one run — red to orange, yellow to green.
Resistance of a wire: R depends on length (slide-wire method)
Slide a contact along a metre of wire and show resistance is directly proportional to length.
Redox titration: ethanedioic acid vs potassium manganate(VII)
Heat, then titrate a self-indicating redox reaction to a permanent pale pink — no indicator needed.
Thermal decomposition: water of crystallisation in hydrated zinc sulfate
Heat a hydrated salt to constant mass and calculate its water of crystallisation.
Qualitative analysis: a mislabelled salt and three manganese oxidation states
Catch a mislabelled bottle with your own tests, then compare manganese across three oxidation states.
Iodine clock: estimating hydrogen peroxide concentration by serial dilution
Time an iodine clock across a serial dilution, then read an unknown concentration off your own curve.
Microscopy and stereology: a plant stem cross-section (slide J1)
Count vascular bundles in a sample sector and scale up to a whole-section density.
Spring oscillations: series vs parallel stiffness
Time the same springs in series and in parallel, and plot √T2 against √T1.
Deformation of paper cylinders: testing w = k(y − p)
Squash a rolled paper cylinder under a spring-loaded mass and test w = k(y − p).