2007-09-25 13:37:06 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
A solution is a homogeneous mixture. Black coffee is a heterogeneous mixture, however, because when you finish it, there are grounds on the bottom of the cup, and if you leave it to get cold and pour it out, there is a sludge at the bottom.
2007-09-25 13:42:06 · answer #1 · answered by steve_geo1 7 · 1⤊ 0⤋
It depends really how the coffee is prepared. If there are no undissolved suspended grounds, then it is a SOLUTION. But then, if you think about it, you really did not intend to have some coffee grounds settling in the bottom or floating on top; what you want is the fine homogeneous liquid, so coffee is a SOLUTION.
2007-10-03 11:39:04 · answer #2 · answered by Aldo 5 · 0⤊ 0⤋
Black coffee is technically a "colloidal suspension".
Noun: colloidal suspension [ku'loydl su'spenshun]
A colloid that has a continuous liquid phase in which a solid is suspended in a liquid.
The solid part of the suspension is fine coffee grounds, the liquid is water.
2007-09-25 20:51:58 · answer #3 · answered by Anonymous · 0⤊ 1⤋