a) How many millimeters of 0.0700 M EDTA are required to react with 50.0 mL of 0.0140 M Cu2+?
b) With 50.0 mL of 0.0140 M Sc3+?
a) Find the conditional formation constant for Sr(EDTA)2- at pH 11.00, where log Kf is 8.72 and αY4- is 0.81. = _________
b) Find the concentration of free Sr2+ in 0.65 M Na2[Sr(EDTA)] at pH 11.00. [Sr2+] = ________M
The conditional formation constant is given by
Where is the fraction of EDTA in the form Y4- at the given pH, and Kf is the formation constant for the given metal-EDTA complex.© BrainMass Inc. brainmass.com March 22, 2019, 1:14 am ad1c9bdddf
You have to use the conditional formation constant in order to find the free concentration of Sr2+. Assuming all the initial concentration forms product, you then assume some of the product forms reactant.
Problems dealing with conditional formation constant in EDTA titrations are solved.