The given volume is a distracter. It is not needed to solve this problem.
Use the GMW and an appropriate volume conversion factor to express the
concentration in g/dL.
5.0 mol
151.9 g
1L
--------X ----------X ------= 76 g/dL
L
mol
10 dL
5-3.
CONVERSION FROM Eq/L TO g/dL AND FROM g/dL TO Eq/L
In solving this type of conversion problem, the method is similar to the one used
to solve for mol/L to g/dL. The g/dL concentration is, as previously stated, defined as
parts of solute per 100 parts of total solution. The normality of a solution is defined as
the number of equivalents per liter of solution (Eq/L).
a. Example 1. What is the g/dL concentration of a 1.5 Eq/L NaOH solution?
Solution. Read the problem carefully and determine the desired unit of
concentration.
Percent concentration (g/dL).
Comparable to problems encountered before that involved normality,
calculating the gram equivalent weight is a good place to start.
NaOH
Na
23.0
O
16.0
H
+ 1.0
40.0 g/mol
40.0 g
1 mol
------X -------- = 40.0 g/Eq
mol
1 Eq
Use the GEW and the appropriate volume conversion factor to express the
concentration as g/dL.
1.5 Eq
40.0 g
1L
------ X --------X ------= 6.0 g/dL
L
Eq
10 dL
MD0837
5-4