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This way of expressing a dilution as a ratio of the parts of solute to the total number of parts is common in biology. The dilution factor (DF) can be used alone or as the denominator of the fraction, for example, a DF of 10 means a 1:10 dilution, or 1 part solute 9 parts diluent, for a total of 10 parts. Problem: If you’ve taken 250 ml of plasma and added 750 ml of distilled water, you have achieved 1:3 dilution. A) True B) False *
