Is Black Coffee a mechanical mixture or a solution?
see below.
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http://www.jiskha.com/display.cgi?id=1285443552
To determine whether black coffee is a mechanical mixture or a solution, we need to understand the difference between the two.
A mechanical mixture is a combination of two or more substances that are physically mixed together. Each component retains its own properties and can be separated physically. Examples include sand and water, nuts and bolts, or salad dressing.
On the other hand, a solution is a homogeneous mixture where the solute (substance being dissolved) is evenly distributed and molecularly dispersed throughout the solvent (substance doing the dissolving). Solutions are transparent and do not separate upon standing. Examples include saltwater, sugar dissolved in water, or air (a mixture of gases).
In the case of black coffee, it is a solution. It is made by dissolving coffee grounds (solutes) in hot water (solvent). The water molecules surround and interact with the coffee particles, dispersing them uniformly throughout the mixture. When coffee is brewed properly, it forms a homogeneous liquid where the coffee particles cannot be seen and do not settle on standing.