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choosejoy
choosejoy asks:
Q:

What is an experiment demonstrating how to kill mold with bleach?

if we are setting up an experiment to test strengths of bleach that kill mold, is it better to lightly sponge the divided sections with different bleach concentrations and wait for the mold to clear or is it better to clean the divided sections with two different concentrations and wait to see if the mold returns?
In Topics: Science fair
> 60 days ago

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Expert

greenprof2
Apr 27, 2010
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What the Expert Says:

An experiment is set up in such a way as to allow you to make a fair comparison. Here you will need to have the same mold growing on the same medium. This can be done in a petrie dish on an agar gel, as scientists do, or on the same piece of moldy bread. You will need to prepare and label your different concentrations of bleach. Start with, for example, 4 or 5 different strengths, such as full strength, then diluted by 25% water, 50% water, and 75% water. Swab the bleach solutions onto the medium with a sterile Q-tip, for example, and don't contaminate the sample with your labels or otherwise by touching the medium (bread or agar). Allow a set amount of time to pass and compare. For documentation, you can take a digital image of the results. I hope this helps.

Michael Bentley, Expert Panel Member

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