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

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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