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CHEM unit 4 edexcel

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qooqo111:
this is about the reaction of aldehyde with HCN ..... so... why should the PH of the reaction be maintained or buffered between 6-8 ??
Thank You :)

Deadly_king:

--- Quote from: qooqo111 on December 18, 2010, 06:50:28 am ---this is about the reaction of aldehyde with HCN ..... so... why should the PH of the reaction be maintained or buffered between 6-8 ??
Thank You :)

--- End quote ---

Too much of H+, that is at a lower pH may cause the aldehyde to get oxidised to a carboxylic acid. This is why we need to keep the aldehyde in a nearly neutral medium. ;)

If the pH is too high, the OH- will react with H+ from HCN such that no reaction will take place with the aldehyde which might as well be reduced by the huge amount of OH-.

Hope it helps :D

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