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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