CRA Description :
In this assignment, students will apply the concepts of conductivity and equivalence point to an acid-base reaction. Students will then determine the concentration in molarity of an unknown Ba(OH)2 solution. Students will first use probeware to collect data as they perform a titration of barium hydroxide with sulfuric acid. They will use the data to support the location of the equivalence point of the reaction between sulfuric acid and barium hydroxide. Using this value and the concentration of the original 0.010 M H2SO4 solution, they will determine the molarity of the Ba(OH)2 solution. Finally, they will calculate their percent error and use it to determine the number of moles of Ba^2+ ions that reacted with SO4^2- ions and with dissolved CO2.
Key Concepts and Terms:
• Students must know the proper procedures for handling lab equipment and hazardous chemicals safely and for responding to chemical spills. • Students must have an understanding of ionic solutions, acids and bases, pH, types of chemical reactions, neutralization reactions, chemical equivalence, the mole concept, solutions, net ionic equations, stoichiometry, and how to write balanced chemical equations. • Students must have a working knowledge of how to use probeware and a graphing calculator or a computer to collect data. • Students must have a working knowledge of how to set up a titration.