Analía Bellizzi – Chemistry Classes

Ronald Reagan Senior High School

Solutions Exercises

Exercises:

Open the following POWERPOINT presentation to see the exercises

IGCSE-SOLUTIONS-EXERCISES-WITH-EXAMPLES 2020-2021

SOLUTION EXERCISES: 

1. How many grams of solute we need to prepare 1L of the following solutions?

  1. 1.5 M LiCl                  ANS: 63.75
  2. 0.3 M K2SO4               ANS: 52.2
  3. 2M NaCl                   ANS: 117
  4. 0.5 M KI                  ANS: 83
  5. 0.05 M (NH4)2S2O8  ANS: 11.4

2.How many grams of solute we need to prepare 250 cm3 of the following solutions?

  1. 1.5 M LiCl                     ANS: 15.93
  2. 0.3M K2SO4                      ANS: 13.05
  3. 2M NaCl                       ANS:  29.25
  4. 0.5 M KI                       ANS: 20.75
  5. 0.05 (NH4)2S2O8              ANS: 2.85

3)  Find the molarity of the following solutions:

  1.   0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution. ANS: 10M
  2.   0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. ANS: 0.171M
  3.   0.5 grams of sodium chloride is dissolved to make 20.0 mL of solution. ANS: 0.43 M 
  4.   7.70 grams of lithium sulfate are dissolved to make 250 mL of solution. ANS: 0.28M
  5.   6.7 x 10-2 grams of PbCl2 are dissolved to make 3.05 mL of solution ANS: 0.0790 M 

The following are old videos explaining more examples