1.0 mol

63.0 g

1.0 L X --------X --------= 63 g HNO3

L

mol

Calculate the grams of HNO3 per milliliter of concentrated liquid.

1.42 g

70

------X ------ = 0.994 g HNO3/mL concentrated liquid

mL

100

Use the grams per milliliter of solute as an appropriate factor times the

number of grams of solute needed to determine the required volume of concentrated

liquid.

mL

63 g X ---------- = 63 mL

0.994 g

b. **Example 2**. How much H2SO4 with a S.G. of 1.84 and an assay of 95% is

required to make 500 mL of a 4.00 Eq/L H2SO4 solution?

Solution. As before, with problems that involve normality, calculating the

gram equivalent weight of the compound involved is a good starting point.

Calculate the GEW of the compound.

H2SO4

H

1.0 X 2 =

2.0

S

32.1 X 1 = 32.1

O

16.0 X 4 = + 64.0

98.1 g/mol

98.1 g

mol

------X ------= 49.0 g/Eq

mol

2 Eq

Determine the amount of solute needed in the desired solution.

1L

4.00 Eq

49.0 g

500 mL X --------X --------X -------- = 98.0 g H2SO4

1000 mL

L

Eq

MD0837

8-5

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