Which part of a fatty acid is hydrophilic?
The carboxylic acid part. The COOH or
Fatty Acids have 2 parts.
1st is the Carboxylic acid part. This group has hydrogen bond donors and acceptors, and is very polar. This part loves water.
2nd part is the "fat" part. It is really just a long carbon chain
Acetic Acid is not a fatty acid, but it is useful to think about it.
If we make this longer, it starts to not dissolve in water.
IF that carbon chain group gets really long, then you've got a fatty acid.