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12 – Ethyne

Organic Chemistry. 12 – Ethyne. Leaving Certificate Chemistry. The Alkynes: C n H 2n - 2. Ethyne: C 2 H 2. Carbon-Carbon triple bond. 2 Carbons Longest Chain. H. C. C. H. 2 planar carbons. The Alkynes - Ethyne. Mandatory Experiment. Preparation of Ethyne. Preparation of Ethyne.

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12 – Ethyne

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  1. Organic Chemistry 12 – Ethyne Leaving Certificate Chemistry

  2. The Alkynes: CnH2n - 2 Ethyne: C2H2 Carbon-Carbon triple bond 2 Carbons Longest Chain H C C H 2 planar carbons

  3. The Alkynes - Ethyne

  4. Mandatory Experiment Preparation of Ethyne

  5. Preparation of Ethyne Calcium Dicarbide CaC2 Water H2O Acidified Copper Sulfate Solution CuSO4 Water added to calcium dicarbide produces ethyne gas with impurities. These impurities are removed by passing them through acidified copper sulfate solution.

  6. Preparation of Ethyne

  7. Impurities Calcium sulfide solid Hydrogen sulfide gas Phosphine gas Calcium phosphide solid Calcium dicarbide

  8. Preparation of Ethyne The first couple of test tubes collected are usually discarded as they contain displaced air from the reaction boiling tube.

  9. Preparation of Ethyne Balanced Equation for the Synthesis of Ethyne CaC2 + H2O 2 C2H2 + Ca(OH)2 Water Ethyne Calcium Dicarbide Calcium Hydroxide

  10. Preparation of Ethyne

  11. Ethyne reaction with acidified potassium permanganate When ethyne gas is bubbled through a solution of acidified potassium permanganate solution a colour change from pink to colourless is observed. This proves that ethyne is an unsaturated compound.

  12. Ethyne reaction with bromine water When ethyne gas is bubbled through a solution of bromine water, colour change from yellow to colourless is observed. This proves that ethyne is an unsaturated compound.

  13. Preparation of Ethyne Ethene is Ethyne Combustion Reaction Balanced Equation for the Combustion of Ethyne C2H2 + 2½ O2 2 CO2 + H2O Turns blue cobalt chloride paper pink Turns Limewater Milky

  14. Uses of ethyne Oxy-acetylene Flame for cutting metals Fuel for Carbide Lamps

  15. So far in organic chemistry

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