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

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

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