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.
13 of 19 experiments
Titration: ethanoic acid vs sodium hydroxide
Open the tap drop by drop, chase the pink endpoint, and calculate the concentration.
Flame tests: identifying metal ions
Clean the loop, burn the salts, and name two unknowns from their flame colours.
Food tests: starch, sugars, protein and fat
Run iodine, Benedict's, biuret and emulsion tests, then identify a mystery food.
Microscopy: onion epidermal cells
Mount, stain and focus a real slide — then draw what you see at ×400.
Ohm's law: V–I characteristics of a resistor
Wire the circuit, sweep the current, and read resistance off your own V–I graph.
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.
Qualitative analysis: identifying the ions in two unknown solids
Run the full test series on two unknown solids and name every ion from the evidence.
Dye uptake in celery: does warmer water speed up the xylem stream?
Time dye moving up celery in ice-cold and warm water, and find the rate that warmth buys you.
Moments: finding the weight of an unknown mass
Balance a pivoted ruler against two known loads and find an unknown weight two independent ways.
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.
Refraction through a rectangular glass block
Trace a ray through a glass block with pins, and see why spacing them out sharpens your angle.
Thermal decomposition: water of crystallisation in hydrated zinc sulfate
Heat a hydrated salt to constant mass and calculate its water of crystallisation.