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Chemistry Revision

Chemistry Revision. Neutralisation & Electrolysis. Neutralisation. Neutralisation occurs when an Acid reacts with an Alkali Examples of Acids: Hydrochloric acid HCl Sulphuric Acid H2SO4 Nitric Acid HNO3 Examples of Alkalis: Sodium Hydroxide NaOH Ammonia NH3NH4OH.

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Chemistry Revision

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  1. Chemistry Revision Neutralisation & Electrolysis

  2. Neutralisation • Neutralisation occurs when an Acid reacts with an Alkali • Examples of Acids: • Hydrochloric acid HCl • Sulphuric Acid H2SO4 • Nitric Acid HNO3 • Examples of Alkalis: • Sodium Hydroxide NaOH • Ammonia NH3NH4OH

  3. Neutralisation Example • Acid + Alkali = Salt + Water • Hydrochloric Acid + Sodium Hydroxide = Neutral solution of Sodium Chloride + Water • HCl + NaOH = NaCl + H2O

  4. Electrolysis • Electrolysis is the decomposition of an ionic compound using Electricity • A current is passed through the molten compound via a cathode (negative electrode) and anode (positive electrode) • Positive ions travel to the cathode • Negative ions travel to the anode • As a result the original compound is decomposed

  5. Electrolysis Example • Sodium Chloride solution NaCl decomposed using Electrolysis gives the following result: • The positive Na ions are attracted to the cathode2Na+ + 2e- = 2Na • The negative Cl ions are attracted to the anode2Cl- = Cl2 + 2e- • 2NaCl = 2Na liquid + Cl2 gas

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