Topic 6 Organic analysis

• How to test for a carboxylic acid? [3]

  Add 2cm of solution you want to test

  Add a small spatula of sodium carbonate

  If effervescence the COOH
• A beam of Infa red radiation is passed through a chemical and is absorbed by covalent bonds which increases their vibrational energy

  Different bonds absorb different frequencies

  Produces a graph so able to identify functional groups
• For an infa red graph the region between 500-1500 is called the fingerprint region which is unique to a particular compound
• How does infa red have an impact on radiation? [3]

  Some of the electromagnetic radiation eliminated ny the sun reaches earth and is absorbed. The earth re-emits some of it as IR. Molecules of greenhouse gases in atmosphere absorb the IR. Burning fossil fuels and leaving rubbish in landfill has caused rise in greenhouse gases
• Amines N-H 3300-3500
• Alcohols O-H 3230-3550
• Organic molecules C-H 2850-3300
• Carboxylic acids O-H 2500-3000
• nitriles C=-N 2220-2260
• Aldehyde ketone carboxylic esters C=O 1680-1750
• Alkenes C=C 1620-1680
• alcohols carboxylic C-O 1000-1300
• Most organic C-C 750-1100