Calculate the grams of H2SO4 per milliliter of concentrated liquid.
1.84 g
95.0
--------X -------- = 1.75 g H2SO4/mL concentrated liquid
mL
100
Use the grams of solute per milliliter of concentrated liquid as an appropriate
factor times the number of grams of solute needed to determine the required volume of
concentrated liquid.
mL
98.1 g X -------- = 56.1 mL
1.75 g
c. Example 3. How much concentrated HCl with an S.G. of 1.19 and an assay
of 38.0% is required to make 250 mL of a 20.0 g/dL HCL solution?
Solution. Read the problem carefully and determine the desired quantity.
Milliliters of concentrated HCl.
Calculate the amount in grams of solute needed to prepare the solution.
1 dL
20.0 g
250 mL X ------X --------= 50.0 g of HCl needed
100 mL
dL
Determine the grams of HCl per milliliter of concentrated liquid.
1.19 g
38.0
------X ------= 0.452 g HCl/mL of concentrated liquid
mL
100
Use the grams of solute per milliliter of concentrated liquid as an appropriate
factor times the number of grams of solute needed to determine the required volume of
concentrated liquid.
mL
50.0 g X ---------- = 111 mL
0.452 g
8-6.
DETERMINING THE CONCENTRATION OF CONCENTRATED LIQUIDS
At times, it may be necessary to determine the concentration of a commercial
liquid such as the mol/L, Eq/L, or g/dL concentration. To do this consider the definition
of each unit of concentration, then multiply the density (g/mL), given on the bottle times
MD0837
8-6
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