What makes a solution a homogeneous mixture?

there is only one component.

it is uniform in composition.

the mixture has multiple colors.

the mixture contains solids and liquids.

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3