Why is Acetone soluble in water?

Acetone is polar and water is polar. the solubility rule is as follows: "like dissolve like" meaning the more similar the polarity of two substances, the greater their ability to interact with each other.The carbonyl (i.e. C=O)residue in acetone (CH3COCH3 is the real formula) which is polar in nature due to the difference in electronegativity b/wn C and O, forms an overall molecular dipole in acetone. This molecular dipole is nearly identical to water--in fact, acetone has a dielectric constant of about 77 while water's dielectric constant is about 80 at room temperature and thus would be soluble in water.

Hydrogen bonding DOES occur between acetone and water as the oxygen of acetone's cabonyl can hydrogen bond with the O-H bonds of water. However, the presence of such hydrogen bonding would in fact only lend to the ability of the two types of molecules to be miscible with each other.