The chlor-alkali industry

If an electric current is passed through concentrated sodium chloride solution, hydrogen gas forms at the negative electrode and chlorine gas forms at the positive electrode. A solution of sodium hydroxide forms. You might have expected sodium metal to be...

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Predicting the products of electrolysis

Ionic substances in solution break down into elements during electrolysis. Different elements are released depending on the particular ionic substance. At the negative electrode At the negative electrode, positively charged ions gain electrons. This is reduction,...

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Electroplating

Electrolysis is used to electroplate objects. This is useful for coating a cheaper metal with a more expensive one, such as copper or silver. How it works The negative electrode should be the object that is to be electroplated The positive electrode should be the metal that...

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Making insoluble salts

Insoluble salts do not dissolve in water. They can be made by mixing appropriate solutions of ions together. Soluble and insoluble salts   SolubleInsoluble All nitratesNone Most sulfatesLead sulfate, barium sulfate Most chlorides, bromides and iodidesSilver chloride, silver bromide,...

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Electrolysis

Electrolysis is the process by which ionic substances are broken down into simpler substances using electricity. During electrolysis, metals and gases may form at the electrodes. What is electrolysis? Ionic substances contain charged particles called ions....

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