Describe one method of producing oxygen gas.
Decomposition of Hydorgen peroxide solution, H2O2, using Manganese (IV) oxide as a catalyst. Effervescence is observed as the oxygen gas is evolved and the gas can be collected by displacement of water in a test tube (safer) or in a gas syringe.
GI
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A chemist needs to neutralise aqueous hydrochloric acid solution (currently pH 1) to pH 7 or higher, so it can be safely disposed of. They have access to solid NaCl, NaBr and Na2CO3.
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