A crack in the basement foundation has resulted in mold growing on the floor/carpet, possibly the wall. What do I use to get rid of it and how?

Is it white and fluffy? If it is it may not be mold.
This requires muratic acid or Dryloc etch.

Mold is usually removed with bleach and water.

Have you fixed the crack? Bleach will get rid of mold, but is not good on carpet.

This is taken from the Canadian Mortgage and Housing Association web site. Of course the first step is to fix the moisture problem.

How to clean up mold problems

* “Small areas” of mold can be cleaned with a detergent solution.
* Wear a mask, safety goggles and rubber gloves.
* Seek professional help if there is a lot of mold or if mold comes back after cleaning.

Bleach is NOT recommended

The presence of organic (humic) materials, the pH (acidity/alkalinity) of the water, the surface material and contact time affect the effectiveness of bleach for disinfection. Since these factors are not generally controlled, bleach cannot be relied upon for disinfection. The most compelling reason for advising against bleach is that fumes are harmful but in addition, overuse of bleach will result in increased releases of chlorinated effluents which can be harmful to the environment.