Question:
Describe the preparation of
(a) 500 mL of 0.0750 M AgNO3 from the solid reagent.
(b) 2.00 L of 0.325 M HCl, starting with a 6.00 M
solution of the reagent.
(c) 750 mL of a solution that is 0.0900 M in K+,
starting with solid K4Fe(CN)6.
(d) 600 mL of 2.00% (w/v) aqueous BaCl2 from a
0.500 M BaCl2 solution.
m
er as
(e) 2.00 L of 0.120 M HClO4 from the commercial
reagent [60% HClO4 (w/w), sp gr 1.60].
co
eH w
(f) 9.00 L of a solution that is 60.0 ppm in Na+, starting
o.
with solid Na2SO4.
rs e
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Answer :
o
aC s
vi y re
ed d
ar stu
The mass is calculated by the formula as follows:
…... (1)
is
Th
Here, m is the mass, M is the molar mass, V is the volume, and M is
the molarity of the solution.
The concentration or the volume of the solution is determined by the
sh
formula as follows:
…... (2)
Here, is the molarity of solution 1, is the volume of solution
1, is the molarity of solution 2, and is the volume of solution
2.
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Moles in the solution are determined as the product of molarity and
volume. Mathematically, …... (3)
Here, n is the moles, V is the volume and M is the molarity.
Volume is calculated as the ratio of moles and molarity. Mathematically,
…... (4)
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(a)
o
Calculate the amount of by using equation (1).
aC s
vi y re
Substitute for M, 500 mL (or ) for V, and for M
in equation (1) as follows:
ed d
ar stu
is
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Therefore, of is prepared by dissolving of
in water and dilute to .
sh
(b)
Calculate the volume by using equation (2).
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Substitute for , for , for in equation (2) as
follows:
Now, convert the liters into milliliters (mL) using the following conversion factor:
m
Therefore, the desired solution is prepared by diluting of the
er as
with enough water to make total volume.
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(c)
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Convert volume from mL to L by the conversion factor as follows:
vi y re
ed d
Therefore,
ar stu
is
Th
Calculate the moles of by using equation (3).
sh
Substitute for M and for V in equation (3) as follows:
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The molecule contains four moles of . The molar mass of
is . Calculate the mass of as follows:
Therefore, the desired solution is prepared by dissolving in
water and dilute it to .
(d)
m
er as
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The molar mass of is .Calculate the moles of 600 mL of
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aqueous rs e as follows:
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o
aC s
vi y re
Calculate the volume of from by using the
equation (4). Substitute, for n and for M as follows:
ed d
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is
Th
Convert the volume from L to mL by the conversion factor as follows:
sh
Therefore, the desired solution is prepared by diluting of
in enough water up to of total volume.
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(e)
Calculate the moles of by the equation (3).
Substitute for V and for M as follows:
The molar mass of is and specific gravity is 1.60.
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Calculate the molarity of 60% commercial reagent as follows:
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Substitute for n and in equation (4) to calculate the volume
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of as follows:
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is
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Therefore, the desired solution is prepared by the dilution of in
water to yield .
sh
(f)
Convert ppm to by the conversion factor as follows:
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Therefore,
Calculate the mass of as follows:
The compound gives 2 moles of . The molar mass of is
and the molar mass of is , respectively.
m
er as
Calculate the mass of as follows:
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o.
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Therefore, the desired solution is prepared by dissolving in water
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and bring to 9.00 L total volume.
vi y re
ed d
ar stu
is
Th
sh
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