202
Stolchlometry III: Calculations Based on Concentrations of Solutions
(d) 230 ml of 0.460 M LiOH from solid LiOH
(e) 7.57 liters of 1.10 M KCr(SO 4 ) 2 from solid KCr(SO 4 ) 2 - 12H 2 O
25. Tell how you would prepare each of the following solutions.
(a) 750 ml of 0.55 M H 3 PO 4 from 3.60 M H 3 PO 4
(b) 12 liters of 3.0 M NH 3 from 15 M NH 3
(c) 25 ml of 0.020 M Pr 2 (SO 4 ) 3 from 0.50 M Pr 2 (SO 4 ) 3
(d) 365 ml of 0.0750 M K 4 Fe(CN) 6 from 0.950 M K 4 Fe(CN) 6
26. Tell how you would prepare each of the following solutions (weight percentage
given).
(a) 650 ml of 0.350 M A1C1 3 from a 16.0% solution whose density is 1.149g/ml
(b) 1.35 liters of 4.35 M NH 4 NO 3 from a 62.0% solution whose density is 1.294
g/ml
(c) 465 ml of 3.70 M H 3 PO 4 from an 85.0% solution whose density is 1.689
g/ml
(d) 75.0 ml of 1.25 M CuCl 2 from a 36.0% solution whose density is 1.462 g/ml
(e) 8.32 liters of 1.50 M ZnCl 2 from a 60.3% solution whose density is 1.747
g/ml
27. Find the molalities of the original solutions used in Problem 26.
28. The density of a 3.68 M sodium thiosulfate solution is 1.269 g/ml.
(a) Find the percentage of Na 2 S 2 O 3 by weight.
(b) What is the molality of this solution?
29. The solubility of Hg 2 Cl 2 is 7.00 x 1Q-" g per 100 g of water at 30°C.
(a) Assuming that the density of water (1 g/ml) is not appreciably affected by
the presence of this amount of Hg 2 Cl 2 , determine the molarity of the
saturated solution of Hg 2 Cl 2 .
(b) What is the molality of this solution?
30. A pharmaceutical house wishes to prepare a nonirritating nose-drop preparation. To do this, it will put the active agent in a "normal saline" solution, which
is merely 0.90% NaCl by weight. What quantities of material will be needed if
it is desired to make 3000 gal of nose-drop solution that is normal saline and
contains 0.10% active agent? (The density of 0.90% NaCl solution is 1.005
g/ml.)
31. If 500ml of 3.00 M H 2 SO 4 is added to 1.50 liters of 0.500 M H 2 SO 4 , what is the
resulting concentration?
32. What volume of 15.0 M NH 3 should be added to 3.50 liters of 3.00 M NH 3 in
order to give 6.00 liters of 5.00 M NH 3 on dilution with water?
33. The density of a 1.660 M Na2Cr 2 O 7 solution is 1.244 g/ml.
(a) Find the percentage of Na 2 Cr 2 O 7 by weight.
(b) If 1.50 liters of water are added to 1.00 liter of this solution, what is the
percentage by weight of Na2Cr 2 O 7 in the new solution?
34. If 35.0 ml of 0.750 M A1(NO 3 ) 3 are added to 100 ml of 0.150 M A1(NO 3 ) 3 , what
will be the resulting concentration
9
Stolchlometry III: Calculations Based on Concentrations of Solutions
(d) 230 ml of 0.460 M LiOH from solid LiOH
(e) 7.57 liters of 1.10 M KCr(SO 4 ) 2 from solid KCr(SO 4 ) 2 - 12H 2 O
25. Tell how you would prepare each of the following solutions.
(a) 750 ml of 0.55 M H 3 PO 4 from 3.60 M H 3 PO 4
(b) 12 liters of 3.0 M NH 3 from 15 M NH 3
(c) 25 ml of 0.020 M Pr 2 (SO 4 ) 3 from 0.50 M Pr 2 (SO 4 ) 3
(d) 365 ml of 0.0750 M K 4 Fe(CN) 6 from 0.950 M K 4 Fe(CN) 6
26. Tell how you would prepare each of the following solutions (weight percentage
given).
(a) 650 ml of 0.350 M A1C1 3 from a 16.0% solution whose density is 1.149g/ml
(b) 1.35 liters of 4.35 M NH 4 NO 3 from a 62.0% solution whose density is 1.294
g/ml
(c) 465 ml of 3.70 M H 3 PO 4 from an 85.0% solution whose density is 1.689
g/ml
(d) 75.0 ml of 1.25 M CuCl 2 from a 36.0% solution whose density is 1.462 g/ml
(e) 8.32 liters of 1.50 M ZnCl 2 from a 60.3% solution whose density is 1.747
g/ml
27. Find the molalities of the original solutions used in Problem 26.
28. The density of a 3.68 M sodium thiosulfate solution is 1.269 g/ml.
(a) Find the percentage of Na 2 S 2 O 3 by weight.
(b) What is the molality of this solution?
29. The solubility of Hg 2 Cl 2 is 7.00 x 1Q-" g per 100 g of water at 30°C.
(a) Assuming that the density of water (1 g/ml) is not appreciably affected by
the presence of this amount of Hg 2 Cl 2 , determine the molarity of the
saturated solution of Hg 2 Cl 2 .
(b) What is the molality of this solution?
30. A pharmaceutical house wishes to prepare a nonirritating nose-drop preparation. To do this, it will put the active agent in a "normal saline" solution, which
is merely 0.90% NaCl by weight. What quantities of material will be needed if
it is desired to make 3000 gal of nose-drop solution that is normal saline and
contains 0.10% active agent? (The density of 0.90% NaCl solution is 1.005
g/ml.)
31. If 500ml of 3.00 M H 2 SO 4 is added to 1.50 liters of 0.500 M H 2 SO 4 , what is the
resulting concentration?
32. What volume of 15.0 M NH 3 should be added to 3.50 liters of 3.00 M NH 3 in
order to give 6.00 liters of 5.00 M NH 3 on dilution with water?
33. The density of a 1.660 M Na2Cr 2 O 7 solution is 1.244 g/ml.
(a) Find the percentage of Na 2 Cr 2 O 7 by weight.
(b) If 1.50 liters of water are added to 1.00 liter of this solution, what is the
percentage by weight of Na2Cr 2 O 7 in the new solution?
34. If 35.0 ml of 0.750 M A1(NO 3 ) 3 are added to 100 ml of 0.150 M A1(NO 3 ) 3 , what
will be the resulting concentration
9