Testing for cations: NaOH(aq) and NH₃(aq) sim
Carry a real dropper to eight cation solutions: watch each precipitate form, stay or dissolve in excess, and warm ammonium to turn damp red litmus blue.
Qualitative analysis: cations · covers the O-Level, IGCSE, GCSE topic
Use it in your lessons
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Free guide: 12 practicals as sims, and how to run one in a lesson →
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More chemistry sims
- Catalysts and enzymes: decomposing hydrogen peroxide simWeigh a catalyst, add it to hydrogen peroxide, read the gas syringe every 10 s, compare the curves, then filter and reweigh the catalyst and test the gas.
- Thermometric titration simAdd sodium hydroxide to acid in a polystyrene cup a portion at a time, stir, record the temperature, and find the end point and the acid's concentration where two best-fit lines meet.
- Making ammonia simHeat the dry mixture: 2NH₄Cl + Ca(OH)₂ → CaCl₂ + 2NH₃ + 2H₂O.
- Testing for anions simEach tube holds 2.0 cm³ of a 0.1 mol/dm³ solution of one sodium salt; the eighth holds 5 cm³ of limewater.
- The atom builder simProtons (mass 1, charge +1) and neutrons (mass 1, charge 0) sit in the nucleus; electrons (mass 1/1840, charge −1) sit in shells round it.
- The blast furnace simThe zone temperatures are the lesson's (about 700, 900, 1200 and 1900 °C, and iron tapped at about 1500 °C).