A mother finds her daughter's mug of hot cocoa on a table an hour after she had been drinking it. As the mother pours out the cocoa, she sees brown solids in the bottom of the mug. How can this be explained? (1 point)

Question

A mother finds her daughter's mug of hot cocoa on a table an hour after she had been drinking it. As the mother pours out the cocoa, she sees brown solids in the bottom of the mug. How can this be explained? (1 point)
The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went up.
All dissolved substances will come out of solution over time. If the mother
• waits long enough, then all of the powder will appear at the bottom of the mug.
This would only happen if too much cocoa powder was added in the first place, because the solubility should not change.
The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went down.

GPT-4o mini · Answer

The correct explanation for the brown solids at the bottom of the mug is:

The cocoa was mixed with hot water, but some cocoa settled as it cooled because the solubility went down.

When hot cocoa is prepared, more cocoa powder can dissolve in hot water due to increased solubility at higher temperatures. As the cocoa cools, its solubility decreases, causing some of the dissolved cocoa to come out of solution and settle at the bottom of the mug.