Chemical Principles in the Laboratory
11th Edition
ISBN: 9781305264434
Author: Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher: Brooks Cole
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11. Which is a highly purified compound that serves as a reference material in titration?
A. secondary standard B. indicator solution
C. primary standard
D. reference solution
25. Consider a system that includes both the Al(OH)3(s) (Ksp = 3 x 10-34) and the complex ion [Al(OH)4]- (Kf = 3 x 1033). What would be the effect of decreasing the pH of the solution?
A. The mass of Al(OH)3 would increase.
B. The concentration of [Al(OH)4]-would increase.
C. The concentration of [OH-] (aq) would increase.
D. Adjusting the pH would not impact the concentration of any of the species in solution.
The answer is A, but can youp lease help explain why this is true? Thanks!
Consider the titration of 50.0 mL 0.1250 M KOH with 0.07500 HClO4 M.
a. Write the balanced reaction which occurs during the titration:Reaction:
b. Determine the pH of the solution before the titration begins.
c. Determine the pH of the solution after the addition of 40.0mL acid.
d. Determine the pH of the solution at the equivalence point.
e. Determine the pH of the solution after 125.0mL acid has been added.
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