How soluble are coffee grounds in water?

* Composition: Coffee grounds are primarily made up of cellulose and lignin, which are complex organic compounds that don't dissolve easily in water.

* Extraction Process: When you brew coffee, you're actually extracting soluble compounds like caffeine, oils, and sugars from the grounds. The grounds themselves remain mostly intact.

* Residue: After brewing, you're left with coffee grounds as a solid residue. This residue is what gets discarded or used for composting.

While a tiny amount of the grounds may dissolve, the vast majority of them remain undissolved in the brewed coffee.

Note: If you're talking about instant coffee, the process is different. Instant coffee is already pre-dissolved and dried, so it dissolves easily in water.