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Big hi to all of you! I'm an undergraduate following a Bsc in bioscience. Trust me I know the feeling of surfing around the net for ages and getting nothing in return! Or getting something worthless for the time we spent surfing. So I started this blog adding the science stuff I have noted which I think might help someone in their home work. Ok then enjoy!

13 February 2011

Tests for Carboxylic acid - Discussion

Acetic acid
Benzoic acid

Salicylic acid
 Cinnamic acid




Solubility
Acetic acid is soluble in water but Benzoic acid,salicylic acid and cinnamic acid are insoluble due to their heavy molecular weight and increased hydrophobic nature. Carboxylic acids are acidic therefore they can dissolve in bases such as ethanol and sodium hydroxide forming the carboxylate ion/salt.


Reaction with Sodium carbonate
Reacts with sodium carbonate liberating carbon dioxide

Esterification
Acetic acid----> Medicinal or strong odour of apples
Benzoic acid----> Fruity odour
Salicylic acid----> Medicinal odour
Reaction with Ferric chloride
Higher acidity can interfere the final results. Therefore it's important to use neutral ferric chloride neutralized by sodium hydroxide.
FeCl3 + C6H5COO-   -------->     Fe ( OOC6H5)3
FeCl3 + CH3COO-   -------->     Fe ( OOCH3)3
Cinnamic acid with KMnO4
This will give out Benzaldehyde and acetic acid. Almond odour was given due to the formation of benzaldehyde.
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1 comment:

  1. UnknownMarch 18, 2019 at 7:38 AM

    16α-Hydroxydehydrotrametenolic acid is a triterpene carboxylic acid isolated from the sclerotium of Poria cocos(Schw.)Wolf. 16α-Hydroxydehydrotrametenolic acid

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