Description: A standard Hoffman apparatus demonstration. Voltage is applied to the system and water is broken down into hydrogen and oxygen. The relative amounts of each gas is 2:1. Bromothymol blue indicator is mixed into the solution. The solution turns blue (basic) on the side that hydrogen is produced, and yellow (acidic) on the side that oxygen is produced.

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Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year or vol: 4 page: 156

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