A solution containing red blood cells at a concentration of 2000 cells per mL undergoes three serial dilution steps, whereby 1 mL of starting solution is diluted with 9 mL of solvent at each step. What is the concentration of red blood cells after the final dilution step? A) 666 cells mL^-1 B) 2.47 cells mL^-1 C) 2 cells mL^-1 D) 20 cells mL^-1 E) 74.1 cells mL^-1

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Quizplus · Accepted Answer

Each dilution step reduces the concentration by a factor of 10 (1 mL of solution + 9 mL of solvent). After three dilutions: 2000 / 10 / 10 / 10 = 2 cells/mL.

A Solution Containing Red Blood Cells at a Concentration of 2000