Question

You are testing a river water sample. Your original plate shows 100 coli forms colonies. Assuming you did the serial dilution correctly, how many coli form colonies would you expect to see in your 1:10 plate? Your 1:100 plate? Explain

Answer 1

I believe the correct answer to be:

1:10 plate: 10 colonies.
1:100 plate: 1 colony.

As serial dilution is the process in which each step diiute the sample 10 times so the frist 1:10 plate is diluted 10 times from the original plate and the 1:100 plate is diluted 100 times compared to original plate.

So the number of colonies would also decrease based on dilution so,

100/10 = 10 colonies for 1:10 diluted plate and
100/100 = 1 colony for 1:100 diluted plate.

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