1. It is known that when an ester forms, the hydroxyl group from the acid reacts

Question

1. It  is  known  that  when  an  ester  forms,  the hydroxyl group  from  the  acid  reacts  with  the hydrogen atom  on  the  alcohol  to  form  water,  rather  than  the hydroxyl group  from  the alcohol reacting with the hydrogen atom from the acid. How do you suppose they could tell one oxygen from another? (Hint: Can oxygen atoms have different masses?)

2. (The  esterification  reaction  of  methanol,  CH3OH,  with  the  acid  group  on  salicylic acid, do not need to show this.)
Why is the presence of an acid necessary?

3. (The  esterification  reaction  of  methanol  with  acetic  acid,  the  esterification reaction of methanol with acetic anhydride, do not need to show this.)
If we used water as the solvent during recrystallization, acetylsalicylic acid would decompose back to the original starting material. Show the decomposition reaction.
1. It  is  known  that  when  an  ester  forms,  the hydroxyl group  from  the  acid  reacts  with  the hydrogen atom  on  the  alcohol  to  form  water,  rather  than  the hydroxyl group  from  the alcohol reacting with the hydrogen atom from the acid. How do you suppose they could tell one oxygen from another? (Hint: Can oxygen atoms have different masses?)

2. (The  esterification  reaction  of  methanol,  CH3OH,  with  the  acid  group  on  salicylic acid, do not need to show this.)
Why is the presence of an acid necessary?

3. (The  esterification  reaction  of  methanol  with  acetic  acid,  the  esterification reaction of methanol with acetic anhydride, do not need to show this.)
If we used water as the solvent during recrystallization, acetylsalicylic acid would decompose back to the original starting material. Show the decomposition reaction.
reaction of methanol with acetic anhydride, do not need to show this.)
If we used water as the solvent during recrystallization, acetylsalicylic acid would decompose back to the original starting material. Show the decomposition reaction.
If we used water as the solvent during recrystallization, acetylsalicylic acid would decompose back to the original starting material. Show the decomposition reaction.

Explanation / Answer

1]this is because the hydroxyl group is more acidic in nature and ittacks the corresponding H+ ion and forms the respective ester

2]this reaction can be carried backward too that is ester and water can react together to form an acid and alcohol...to avoid this back reaction sulphuric acid is used...it is basically a dehydrating agent and absorbs the water..

3](one mole of aspirin) + (one mole of water) = (1 mole of salicylic acid) + (1 mole of acetic acid)

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