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Example: What would be produced during electrolysis of a sulphuric acid H2SO4(aq) solution? OH- and SO42- anions attracted H+ cations (from acid and water) attracted SO42- remains in solution, O2 given off H2 given off 2H+(aq)+ 2e-H2(g) sulphuric acid solution (electrolyte) 4OH-(aq)2H2O(l)+ O2(g) + 4e- Practice: What would you observe during electrolysis of (i) silver nitrate solution; (ii) magnesium iodide solution? Give relevant half equations. (answers at end of topic) In this reaction, water is being split up into hydrogen and oxygen. 2H2O(l) 2H2(g) + O2(g) We would observe that twice the volume of hydrogen is collected compared to oxygen. This proves that the chemical formula for water is H2O. Similar experiments can be used to determine the formula of other simple compounds that split up into gaseous elements during electrolysis.PDF Image | Electrolysis is using an electric current
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