A student expects acetone (CH3COCH3) to be less soluble in water than 1-propanol (CH3CH2CH2OH) because acetone has a slightly smaller dipole moment (2.9 D vs. 3.4 D). Experimentally, however, both liquids are completely miscible with water. In one or two sentences, explain why acetone’s solubility does not follow the simple dipole-moment comparison.