You're right to be confused! Triglycerides are indeed very hydrophobic, meaning they don't mix well with water (a polar solvent). Acetone, while polar, is not as polar as water. This makes it a better solvent for non-polar substances like triglycerides.

Here's why:

* Triglycerides are primarily composed of long hydrocarbon chains. These chains are non-polar and don't interact well with water molecules.

* Acetone, while polar, has a significant non-polar component. It has a carbonyl group (C=O) that is polar, but the rest of the molecule is a hydrocarbon chain. This allows acetone to interact with the non-polar hydrocarbon chains of triglycerides.

Think of it like this: Acetone acts as a bridge between the non-polar world of triglycerides and the polar world of water. It's not perfect, but it allows for some solubility.

It's important to note: While triglycerides are more soluble in acetone than water, they're still not completely soluble. You'll likely see some separation, with a layer of triglycerides forming at the top of the acetone solution.