Carboxylic Acids and Esters' solubility in water?

Question

I have two questions:

1) What evidence is there that carboxylic acids are soluble or insoluble in aqueous solution?
2) What evidence is there that esters are soluble or insoluble in aqueous solution?

EXPLAIN THIS EVIDENCE IN TERMS OF MOLECULAR STRUCTURE

your help will be greatly appreciated!!!!!

By the way, I'd appreciate it if you explain it in a language that I can actually understand. Chemistry is hard enough...

Answer 1

The evidence is there in terms of known solubility limits. Acetic acid is soluble in water in all proportions (vinegar is about 1 M acetic acid), as is EtOAc (ethylacetate). The lower acids and esters both have the highly polar -(C=O)-O unit in their structure which can act as hydrogen ion attractors in aqueous solution.

Answer 2

RE: Solubility of carboxylic acids and esters? What evidence is there that the carboxylic acids are soluble or insoluble in water? What evidence is there that the esters are soluble of insoluble in water? Explain in terms of molecular structure Also, what does sulfuric acid do to speed up an esterification reaction?