Question 1

1. Calculate the concentration of free

Cr

³⁺ ion when 0.010 mol of

Cr(NO

₃)₃ is dissolved in a litre of solution buffered at pH = 10.0, and the

K

_f for

Cr(OH)

₄^- = 8.0 x 10²⁹.

Question concept: This question involes the calculation of the concentration of a metal ion in equilibrium with a Lewis base, in aqueous solution.

Challenge: What is the concentration? Enter it below in scientific notation. (Ex. 5.82 x $10$ ^-10 M would be entered as 5.82E-10) If your response is correct, continue on to Section 19: Biological Applications of pH! If you do not feel comfortable with the concepts presented in this section, review the section material, attempt the question and then follow the guided solution in the following questions. The guided solution is most beneficial for those who have already attempted to solve the question.