You have performed a serial dilution of an unknown sample and counted 73 cfu on a countable plate that was marked as a 10^-4 dilution and you used a 0-.1 ml to inoculate the plate. what is the population density of the original sample?

Hey there!:

To find the original sample population density, divide the conted colonies by the dilution factor and the inoculate:

= 73 / (10⁻⁴ * 0.1)

= 73*10⁵

Thus, the original sample's population density was 7.3*10⁶ or 73* 10⁵.

Hope this helps!

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the answer for sodium is 0.186

the answer for rubidium is 0.251