Your videos are great, I will definitely be recommending them to my peers. Are you planning to make videos on module 2 and 3 of this unit any time soon? Thanks.
Is the effect of the tollens reagent as an oxidising agent impaired by the fact that the carbonyl group in ketones would always be secondary/ tertiary whereas aldehydes are always primary (in terms of the number of C atoms attached to the carbonyl)?
Instead of adding the 2,4-DNP to the solutions in order to eliminate the water, could you instead add acidified potassium dichromate ions and so eliminate the water through seeing no colour change from orange to green? Or is this not in the mark schemes?
Ok thank you :) Just checking because in the lesson we had at school we were told to use acidified dichromate ions? But we were told the 2,4-DNP one too so I guess that's a safer bet
@@theinvinsablechicken but you'd get no colour change for 3 of the bottles as the ketones won't be oxidised by the acidified potassium dichromate as well as the water
but you could do use that for discriminating between the aldehydes and ketones once the water has been identified coz the bottles with the aldehyde will change colour from orange to green as it becomes a carboxylic acid. Obvs this has to be done under reflux
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Your videos are great, I will definitely be recommending them to my peers. Are you planning to make videos on module 2 and 3 of this unit any time soon? Thanks.
Is the effect of the tollens reagent as an oxidising agent impaired by the fact that the carbonyl group in ketones would always be secondary/ tertiary whereas aldehydes are always primary (in terms of the number of C atoms attached to the carbonyl)?
Instead of adding the 2,4-DNP to the solutions in order to eliminate the water, could you instead add acidified potassium dichromate ions and so eliminate the water through seeing no colour change from orange to green? Or is this not in the mark schemes?
+theinvinsablechicken OCR require 2,4-DNP as the test for the carbonyls
Ok thank you :) Just checking because in the lesson we had at school we were told to use acidified dichromate ions? But we were told the 2,4-DNP one too so I guess that's a safer bet
@@theinvinsablechicken but you'd get no colour change for 3 of the bottles as the ketones won't be oxidised by the acidified potassium dichromate as well as the water
but you could do use that for discriminating between the aldehydes and ketones once the water has been identified coz the bottles with the aldehyde will change colour from orange to green as it becomes a carboxylic acid. Obvs this has to be done under reflux
Is sodium hydroxide necessary for tollens r bcos in my textbook it just says silver nitrate dissolved in ammonia
To make Tollen's you need 1 drop of sodium hydroxide. Probably why the exam board and books don't require/mention it
very helpful. thank you very much