b. **Example 2**. What is the Eq/L concentration of a 5.0 g/dL CaCO3 solution?

Solution. Read the problem carefully and determine the desired unit of

concentration.

Normality (Eq/L).

Determine the GEW of the compound.

CaCO3

Ca 40.1 X 1 = 40.1

C

12.0 X 1 = 12.0

O 16.0 X 3 = + 48.0

100.1 g/mol

100.1 g

1 mol

-------- X ------ = 50.05 g/Eq

mol

2 Eq

Use the GEW and the appropriate volume conversion factor to express the

Eq/L concentration.

5.0 g

1 Eq

10 dL

------X -------- X ------ = 1.0 Eq/L

dL

50.05 g

1L

**5-4.**

**CONVERTING FROM mol/L TO Eq/L AND FROM Eq/L TO mol/L**

The conversion is based on the use of TPIV expressed as Eq/mol and used as

an appropriate factor.

a. **Example 1**. What is the mol/L concentration of a 4 Eq/L Ba(OH)2 solution?

Solution. Read the problem carefully and determine the desired unit of

concentration.

Molarity (mol/L).

Determine the number of equivalents per mole of compound and use it as an

appropriate conversion factor to express the solution in the desired units.

4.0 Eq

1 mol

------ X -------- = 2.0 mol/L

L

2 Eq

MD0837

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