Concentration & Volume Calculations Involving Equations


This is part of Year 11 HSC Chemistry course under the topic of Molarity.

HSC Chemistry Syllabus

  • relate stoichiometry to the law of conservation of mass in chemical reactions by investigating:

    – balancing chemical equations (ACSCH039)

    – solving problems regarding mass changes in chemical reactions (ACSCH046)

  • Manipulate variables and solve problems to calculate concentration, mass or volume using: 
– `c = \frac{n}{V}` (molarity formula (ACSCH063))

      Concentration and Volume Calculations Involving Equations

      Example 1

      The reaction between nitric acid and potassium produces potassium nitrate and hydrogen gas.

      What volume of a 0.250 mol L–1 solution of nitric acid is required to completely react with 15.0 g of potassium?

      Example 2

      43.50 mL of a 0.100 mol L–1 solution of sodium hydroxide is required to completely react with a 25.00 mL hydrochloric acid solution.

      Calculate the concentration of the hydrochloric acid solution.

      Example 3

      Excess calcium carbonate is added to a 500.0 mL solution of hydrochloric acid to produce calcium chloride, carbon dioxide and water.

      If 2.20 mol carbon dioxide is produced, what was the concentration of the hydrochloric acid solution?