Chapter 1 – Basic Concepts of Chemistry
Assignment 11
Q.1. 250 mL of 1.5 M solution of sulphuric acid is diluted by adding 5 L of water. What is the molarity of the diluted solution ?
Q.2. What volume of 10 M HCl and 3 M HCl should be mixed to get 1 L of 6 M HCl solution?
Q.3. Commercially available concentrated hydrochloric acid contains 38% HCl by mass.
(i) What is the molarity of the solution (density of solution = 1.19 g mL–1) ?
(ii) What volume of concentrated HCl is required to make 1.0 L of a 0.10 M HCl ?
Q.4. Commercially available sulphuric acid contains 93% acid by mass and has a density of 1.84 g mL–1. Calculate
(i) the molarity of the solution
(ii) volume of concentrated acid required to prepare 2.5 L of 0.50 M H2SO4.
Q.5. The density of 3 M solution of NaCl is 1.25 g mL–1. Calculate the molality of the solution.
Q.6. What is the molality of a solution of methanol in water in which the mole fraction of methanol is 0.25?
Q.7. What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a volume upto 2 L ?
Q.8. If the density of methanol is 0. 793 kg L–1, what is the volume needed for making 2.5 L of its 0.25 M solution ?
Q.9. Calculate the number of Cl– ions in 100 ml of 0.001 M HCl solution.
Q.10. A solution of oxalic acid, (COOH)2.2H2O is prepared by dissolving 0.63 g of the acid in 250 mL of the solution. Calculate molarity of the solution.
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