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Natural Organics
Esters, Soap and Organic Synthesis
Question | Answer |
---|---|
What is the simplest ester? | Methyl methanoate |
What are naturally occurring made from? | An alcohol called glycerol and a long chain carboxylic acid |
What is the naturally occurring ester used to make soap? | Glyceryl Tristearate |
What is the alternative name for saponification? | The base hydolysis of esters as concentrated Sodium Hydroxide is used in the reaction |
Name an important by product of the manufacture of soap? | Glycerol, which can be used to make nitro glycerine, an important explosive |
Why is the ethanol distilled off after the soap has been made? | Ethanol is an irritant that cannot be left in the soap. |
How is the Sodium Hydroxide removed from the soap solution? | The soap solution is rinsed with a brine solution (high salt concentration). The sodium hydroxide will dissolve in the salt water but the soap will not. |
What are the 3 reactants used to make soap? | Lard/Fat, Sodium Hydroxide and Ethanol |
Why is ethanol added to the reaction flask in the making of soap? | Ethanol acts as a solvent in the reaction |
How does soap remove oil dirt and grease? | Soap consists of a long chain non-polar tail with a short polar head. The non polar chain is attracted to non polar oil and grease. Water which is polar then pulls away the polar head, taking the non-polar tail and oil.grease with it. |
Physical properties of esters? | 1: Colourless liquid with a fruity smell 2: Slightly soluble in water but soluble in organic solvents 3: Low boiling point as they cannot form Hydrogen bonds, however the shorter chain esters can form them with water. 4: Found in flowers and fruits |
Examples of naturally occurring organic molecules? | Morphine for pain relief, quinine for malaria prevention, penicillin, aspirin, paracetamol and ibuprofen. Vanilla, benzaldehyde and caffeine for food flavourings. Narcotics like opium, cocaine and heroine. |
What is clove oil used for? | Used in beef flavourings, ham, sausages and sweets. It also has antiseptic properties and is used in perfumes and soaps. |
Chemical name for clove oil? | Eugenol |
Why is steam distillation used to remove the clove oil? | The mixture of water and oil distills the eugenol above the boiling point of the water but below the boiling point of the oil. |
What is an emulsion? | An emulsion is a mixture of oil droplets in water. |
How do we extract the oil from the emulsion? | We use solvent extraction. Adding an organic solvent like cyclohexane allows the eugenol to dissolve. The organic solvent and water can now be separated using a tap funnel. The cyclohexane can now be evaporated leaving the eugenol behind. |