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Chemistry: burning hydrogen produces pure water

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How to prove that burning hydrogen produces pure water as “ash”. In the left-hand bottle bits of zinc are oxidised by a diluted sulphuric acid being poured in; the resulting hydrogen is collected through the second neck and exiccated in the horizontal pipe and burnt at the end of the thin S-shaped pipe, where the combustion product is collected in a bell. The bell clouds with mist that eventually condenses and drips down in a disk: it is pure water.

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