Hello, I need a help in this question, thank you very much!!!
Hi! This question has been answered before but here it is!:))
ethanoic acid → weak acid
Amine → strong base
Therefore they will react
amide → weak base
This weak acid and weak bases do not react together
so row 1 is correct
nitrous acid → weak acid
It will react with both strong and weak bases therefore row 2 is correct!
sulphuric acid → strong acid
It will react with a strong base to become a neutral solution so this row is wrong (even though it will react with the weak base)
therefore row 3 is wrong
So the answer is E, rows 1 and 2. Hope this helps!!
Hello, first of all thank for helping me. I have a question, I remember nitrous acid is weak but why it is strong when react with amides. Hope you can explaining for me, I really appreciate it!!!
Yes! My bad that was a typo!! I corrected it now it’s a weak acid but it does react with both amides and amines
Ohhh, i have more question, so beyond nitrous acid, do we have any weak acid can react with amides? Thank you very much!!!
I’m also sorry for asking too much :(((
I’m not sure if there is another weak acid because amides do rapidly react with weak nitrous acid HNO2 to produce RCOOH (carboxylic acid), nitrogen gas N2 and water. But, by a very different mechanism that is likely to involve a nitrosonium cation NO+ from HONO that attacks the nitrogen of the amide group. However this is out of the scope of the IMAT so you don’t need to worry as much! Just remember it’s because both contain nitrogen :))
Thank you very much!!! I also think in IMAT scope just remember amides react with HONO2, I found some source from Internet and besides some specific reactions of amides, they only said amides undergo reaction with HONO2.
Yep! We just need to know a few reactions with amides(how they are formed too), amines, carboxylic acids, ketones and aldehydes
Thank you so much for helping me!!! Have a great day!
Hey Raya I thought that amines were weak bases. Are always strong bases or it can be weak bases too? Thanks in advance!
Amine is strong base because it has NH2-
“the weaker the base, the stronger the conjugate acid”
You can see NH2- has NH3 as its conjugate acid (Bronsted Lowry) => NH3 is weak so NH2- is strong.
ohhh I thought that the conjugated acid of NH3 (weak base) was NH4 (strong acid)
Uhm no I mean NH2- and you give it 1 H+ => NH3
In Bronsted Lowry NH2- accept a proton => base and NH3 is its conjugate acid (in reality it isn’t acid but I just follow Bronsted Lowry rule)
As you know NH3 is weak and we have the rule “the weaker the base, the stronger the conjugate acid” => NH2- is a strong base
I don’t know if my explanation can help you or not because I’m so bad at explaining for other people, but I hope this can help!
ohhh okay! So both amines and amides are bases, but amines are strong and amides are weak. Thank you so much for your reply
Yes, that’s right!!!