The same amount of red colored Kool-Aid crystals are added to a still glass of thick sugar water and a still glass of distilled water. Both are the same temperature. Neither is stirred. Which should become uniform in color first?
A)The glass of distilled water should become uniform in color first.
B)The glass of thick sugar water should become uniform in color first.
C)Both glasses will become uniform in color at exactly the same time.
D)Without stirring, it is unlikely that either glass will ever become uniform in color.

Question

Quizplus · Accepted Answer

The presence of sugar and other solutes in the thick sugar water will slow down the rate of diffusion of the Kool-Aid crystals, making it take longer for the color to spread throughout the entire volume of water. Distilled water, on the other hand, has no solutes to hinder the diffusion of the Kool-Aid crystals, so the color should spread more quickly and uniformly throughout the water. Therefore, the glass of distilled water should become uniform in color first.

The Same Amount of Red Colored Kool-Aid Crystals Are Added