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Activity in Chemical Equilibrium (Oxley)

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    281990

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    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

    This page titled Activity in Chemical Equilibrium (Oxley) was last modified on Wed, 14 Oct 2020 19:08:42 GMT and is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Contributor via source content that was edited to the style and standards of the LibreTexts platform.