Students should have no access to acid solutions. Small samples of the hydrogen peroxide solution could be collected in a 100 cm 3 beaker. Students can measure 5 cm 3 of each bleach into their side-arm flask for each experiment. Advanced students could make use of oxidation numbers to balance equations, consider electrode potentials for the reactions, and also meet hydrogen peroxide behaving as a reducing agent.Ī few commercial bleaches in their containers, with prices, can be placed on a suitable tray, each with a 10 cm 3 syringe and 250 cm 3 beaker – both labelled – into which small samples of the bleach can be placed. Intermediate students could determine concentration and revise redox reactions and half-equations. Younger students can compare the relative concentration or ‘value’ of different bleaches. This experiment can be done as a demonstration as well as a class practical (with suitable students). They then use this data to compare the chlorine content of different bleaches, and calculate the concentration of sodium chlorate(I) (sodium hypochlorite). In this experiment, students add excess hydrogen peroxide to measured samples of household bleach, collecting and measuring the volume of oxygen produced. RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation.
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