Subjective Type

How do I calculate the dilution factor?

Solution

The dilution factor (or dilution ratio) is the notation used to express how much of the original stock solution is present in the total solution, after dilution.

It often given as a ratio, but can also be given as an exponent, however, this calculator will only show it as a ratio.

Regardless if the dilution factor is a ratio or exponent, it has two forms, either describing the parts of the stock solution to the parts of the dilutant added (S:D) or the parts of the stock solution to the parts of the total solution (S:T).

Let's say you have a 10 $$cm^3$$ aqueous solution of acyl chloride.

However, this is too concentrated for your experiment, so you add 90 $$cm^3$$ of water to further dilute the solution. You end up with 100 $$cm^3$$ of acyl chloride. As you have 10 parts of the stock solution, and 90 parts of the dilutant, the S:D ratio is 1:9 (canceling down from 10:90). In the S:T notation the dilution factor is 1:10, you have 10 $$cm^3$$ of the stock solution that now makes up a 100 $$cm^3$$ solution.

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