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Вы можете ознакомиться и скачать презентацию на тему Caustic Soda. Доклад-сообщение содержит 20 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

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Caustic Soda Learning Objectives: Describe the process of the electrolysis of brine Describe the uses of sodium hydroxide

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Draw the practical set up you would need for electrolysis

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Electrolysis of Brine Practical

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Questions 1 What did the universal indicator show you about the type of substance formed in: a the anode dish b the cathode dish? 2 Chlorine gas is given off at the anode. How can you tell? 3 Suggest the name of an acid that might be formed in the anode dish. 4 Chlorine is an important ingredient in bleach. What observation can you make that shows the bleaching property of chlorine? 5 Why would the experiment not have worked without the filter paper between the two dishes? 6 What would be the problem with connecting the two dishes up with a piece of metal wire? 7 Give the formulae of the two ions found in sodium chloride. 8 Which of these ions will be attracted to: a the anode b the cathode?

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Electrolysis of brine The NaCl will split into Na+ ions and Cl- ions. Water splits into H+ ions and OH- (hydroxide) ions. So what do we think will happen during electrolysis? Remember – Na is VERY reactive, it is much more likely to exist as an ion than hydrogen.

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Now let’s see what actually happens

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Electrolysis of brine The H+ and Cl- ions are discharged at the electrodes.

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Electrolysis of brine Hydrogen comes off at the cathode ( - ) 2H+(aq) + 2e- H2(g) Hydrogen is …… oxidised or reduced?

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Electrolysis of brine Chlorine comes off at the anode ( + ) 2Cl(aq) - 2e- Cl2(g) Chlorine is …… oxidised or reduced?

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Electrolysis of brine The Na+ and OH- ions stay in solution. They join together to form sodium hydroxide. This is a very important alkali

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Hydrogen Used to make margarine (helps to make the oils in the margarine spread on your bread) Used as a fuel (already important in space rockets, but may be the fuel of cars after the oil age)