At times, units of concentration will be given, but another unit of concentration will

be required to perform calculations. In this lesson, we will discuss methods for

conversion from one unit of concentration to another.

Before discussing the methods for converting the above units, let's review the

definition for each unit.

EQUIVALENT WAYS OF EXPRESSING

CONCENTRATION (NO NUMERICAL CONVERSION NECESSARY)

g/dL = parts of solute per 100 parts

g/L = parts of solute per 1000 parts

molarity = moles per liter

The g/dL concentration is defined as parts of solute per 100 parts total solution.

The morlarity of a solution is defined as the number of moles per liter of solution (mol/L).

CONCENTRATION

IN

TO GET CONCENTRATION

BY

EXPRESSED IN

UNITS

EXPRESSED IN

g/L or parts solute

Multiply

mol/L

GMW

g/mol

per 1000 parts

g/L or parts solute

Multiply

g/dL

10

d/L/L

per 1000 parts

dL mol

10

mol/L

Multiply

g/dL

------

-- ----

GMW

L

g

MD0837

5-2

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