Serial dilution is a useful technique because the colonies are counted twice with different people and the average number of colonies is reported as the number of bacteria present in the sample after multiplying the dilution factor. What are two reasons serial dilution is a useful technique for counting populations of bacteria? ) When there are a lot of bacteria, it is hard to count undiluted colonies accurately because there could be hundreds of them. What was the approximate concentration of the original sample? 4 x 1010 cells/ml 4.Ī 1 ml sample of bacteria was diluted to 10-6 and 100? L was plated on the Petri dish at right. The number of viable bacteria in the original sample was a. You dilute 1 ml of an unknown sample of bacteria to 1 x 10-6 and plate out 100? L onto a Petri dish. For only $13.90/page You make six 2-fold serial dilutions of a solution.
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