Skip to main content
Chemistry LibreTexts

Activity in Chemical Equilibrium (Oxley)

  • Page ID
    281990
  • Learning Objectives

    After completing this exercise, students will be able to:

    • Calculate the ionic strength of a solution.
    • Determine the activity coefficient for species in solution.
    • Perform equilibrium calculations using activity.
    1. Calculate the solubility of calcium oxalate, CaC2O4, in (a) water and (b) 0.050 M CaCl2. The Ksp for CaC2O4 is 1.3 x 10-8













     

    1. Calculate the ionic strength of a solution containing 0.050 M CaCl2.












     

    1. Would an equimolar solution of NaCl or CaCl2 have a higher ionic strength? Explain.










     

    1. Calculate the solubility of calcium oxalate, CaC2O4, in 0.050 M CaCl2, including activity coefficients in your calculation. The Ksp for CaC2O4 is 1.3 x 10-8.   



















     

    1. What is the relative error resulting from neglecting activities in calculating the solubility of CaC2O4 in a 0.050 M solution of CaCl2?






     

    1. What is the relative error resulting from neglecting activities in calculating the pH of a 0.100 M HCl solution?






     

    Contributors and Attributions

    • Susan Oxley, St. Mary’s University (San Antonio) (soxley@stmarytx.edu)
    • Sourced from the Analytical Sciences Digital Library
    • Was this article helpful?