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Molarity and Molality Calculations for Various Solutions - Prof. Soma, Exercises of Physical Chemistry

University of Asia Pacific, DhanmondiPhysical Chemistry
Prof. Mahfuza Afroz Soma

A series of mathematical problems related to the calculation of molarity and molality for various solutions of different substances, including acids, bases, and salts. The problems involve determining the molarity of solutions given mass and volume data, calculating mole fractions, and finding molalities. The document also includes problems on normality and density.

Typology: Exercises

2020/2021

Uploaded on 12/27/2021

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Mathematical Problems on Concentration Expression
of Solution
1. Determine the molarity for each of the following solutions:
a. 98.0 g of phosphoric acid, H3PO4, in 1.00 L of solution
b. 0.2074 g of calcium hydroxide, Ca(OH)2, in 40.00 mL of solution
c. 7.0 × 10−3 mol of I2 in 100.0 mL of solution
d. 1.8 × 104 mg of HCl in 0.075 L of solution
e. 1.457 mol KCl in 1.500 L of solution
f. 0.515 g of H2SO4 in 1.00 L of solution
g. 49 g of H2SO4 are dissolved in 250 ml of solution
h. 45 g of glucose, C6H12O6, are dissolved in 500 g of water
2. A 2.00-L bottle of a solution of concentrated HCl was purchased for the general
chemistry laboratory. The solution contained 868.8 g of HCl. What is the
molarity of the solution?
3. What volume of a 0.20M K2SO4 solution contains 57 g of K2SO4?
4. What are the mole fractions of H3PO4 and water in a solution of 14.5 g of
H3PO4 in 125 g of water?
5. What are the mole fractions of HNO3 and water in a concentrated solution of
nitric acid (68.0% HNO3 by mass)?
6. Calculate the mole fraction of each solute and solvent:
a. 583 g of H2SO4 in 1.50 kg of water
b. 0.86 g of NaCl in 1.00 × 102 g of water
c. 25 g of I2 in 125 g of ethanol, C2H5OH
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Mathematical Problems on Concentration Expression

of Solution

  1. Determine the molarity for each of the following solutions: a. 98.0 g of phosphoric acid, H 3 PO 4 , in 1.00 L of solution b. 0.2074 g of calcium hydroxide, Ca(OH) 2 , in 40.00 mL of solution c. 7.0 × 10 −3^ mol of I 2 in 100.0 mL of solution d. 1.8 × 104 mg of HCl in 0.075 L of solution e. 1.457 mol KCl in 1.500 L of solution f. 0.515 g of H 2 SO 4 in 1.00 L of solution g. 49 g of H 2 SO 4 are dissolved in 250 ml of solution h. 45 g of glucose, C 6 H 12 O 6 , are dissolved in 500 g of water
  2. A 2.00-L bottle of a solution of concentrated HCl was purchased for the general chemistry laboratory. The solution contained 868.8 g of HCl. What is the molarity of the solution?
  3. What volume of a 0.20M K 2 SO 4 solution contains 57 g of K 2 SO 4?
  4. What are the mole fractions of H 3 PO 4 and water in a solution of 14.5 g of H 3 PO 4 in 125 g of water?
  5. What are the mole fractions of HNO 3 and water in a concentrated solution of nitric acid (68.0% HNO 3 by mass)?
  6. Calculate the mole fraction of each solute and solvent: a. 583 g of H 2 SO 4 in 1.50 kg of water b. 0.86 g of NaCl in 1.00 × 102 g of water c. 25 g of I 2 in 125 g of ethanol, C 2 H 5 OH
  1. What is the molality of phosphoric acid, H 3 PO 4 , in a solution of 14.5 g of H 3 PO 4 in 125 g of water?
  2. What is the molality of nitric acid in a concentrated solution of nitric acid (68.0% HNO 3 by mass)?
  3. What is molarity and molality of a 13% solution (by weight) of H 2 SO 4? Its density is 1.09 g/ml.
  4. Calculate the molality of a solution of sodium hydroxide which contains 0.2 g of sodium hydroxide in 50 g of the solvent.
  5. Calculate the normality of a solution containing 6.3 g of oxalic acid crystals (Mol. wt. 126) dissolved in 500 ml of solution.
  6. Calculate the molarity and normality of a solution containing 5.3 g of Na 2 CO 3 dissolved in 1000 ml solution. 0.05 M; 0.10 N
  7. What is the normality of a solution containing 28.0 g of KOH dissolved in sufficient water to make 400 ml of solution? 1.25 N
  8. A 6.90 M solution of KOH in water contains 30% by weight of KOH. Calculate the density of the solution. 1.288 gml–^1