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Colourful electrolysis 54 An interesting introduction to the electrolysis of brine (sodium chloride solution). Students use Universal Indicator to help them follow what is happening during the reaction. Lesson organisation This experiment works well if students are directed to make detailed observations and then attempt to explain for themselves what they think is happening. The main issue is likely to be the availability of sufficient U-shaped test tubes. Apparatus and chemicals Eye protection • Each working group will require: U-shaped test tube Clamp and clamp stand Carbon electrodes and electrode holders, 2 of each Electrical leads, 2 Power pack Beaker (100 cm3) Spatula Stirring rod Students will need access to: Sodium chloride (salt) Universal indicator (Highly flammable) Distilled water Technical notes Hydrogen (Highly flammable) Refer to CLEAPSS® Hazcard 48 Chlorine (Toxic, Dangerous for the environment) Refer to CLEAPSS® Hazcard 22A and 47B. Sodium hydroxide (Corrosive) Refer to CLEAPSS® Hazcard 91 Universal indicator solution (Highly flammable) Refer to CLEAPSS® Hazcard 32 and Recipe card 36 If electrode holders are not available, another suitable means of securing the electrodes could be used. Do not use bungs because the products are gases. If distilled water is a problem, then tap water could be used. But it may affect the colours produced, especially in areas with hard water. 161PDF Image | Colourful electrolysis 54
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