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Visit www.KayScience.com for access to 800+ GCSE science videos, quizzes, exam resources AND daily science and maths LIVE TUITION!!! In this video you will learn all the science for this topic to get a grade 9 or A* in your science exams! The formula of water is H₂O, so because there are two hydrogen atoms for every oxygen atom in water, and twice as much hydrogen is produced as oxygen, this means the formula is H₂O. Twice as many hydrogen molecules are produced compared to oxygen. A Hofmann voltameter electrolyses acidified water. This is dilute sulfuric acid. Hydrogen ions are reduced at the cathode. Hydroxide ions are oxidised at the anode. All content, music, images, worksheets are the property of kayscience.com We aim for you to get 100% in your exam by revising and learning with KayScience.