A2ml sample was added to a 18 ml diluent in tube 1 which now has a concentration of 300ng/ml. a 2ml of the sample was moved each time into 18ml of diluent to complete 3 dilutions from the first tube, what is the dilution, final dilution and the concentration of tubes 1, 2,3 and 4

288ng/ml

Explanation:

A serial dilution is any dilution where the concentration decreases by the same quantity in each successive step.  

it to 3 rounds of dilutions for the first tube so 3x6=12 so the 300-12=288

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