Classification: Education/Science >> Further Education >> National College Entrance Examination

Problem description:

There are two chemical equations when the charcoal brazier is placed in a room painted with limewater. Because of what? What about the wall? Because of charcoal fire, the wall will become whiter because of what is generated.

Analysis:

C+O2=CO2

Calcium hydroxide+carbon dioxide = calcium carbonate +H2O

Because of the formation of calcium carbonate, the wall becomes harder and whiter.