When you mix coffee with water to make a cup of coffee is the coffee an impurity?

Answer 1

As opposed to pure water? yes. i suppose it could be considered an impurity if you are striving for pure water.

But if your goal is to make coffee, and the 2 ingredients you need are hot water and coffee, then no, i would not consider coffee and impurity. In that case, milk, or salt, or murcury, or dog feces would all be considered impurities in your pure cup of coffee.

Purity in this case is really a matter of perspective

Answer 2

No, when you mix coffee with water to make a cup of coffee, the coffee itself is not considered an impurity. The coffee grounds are the main ingredient and the water is used as a solvent to extract the flavor and caffeine to create the beverage. Impurities would refer to any other foreign substances present in the mixture that are not part of the intended coffee drink.