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Material Type: Exam; Class: Elementary Quantitative Analysis; Subject: Chemistry ; University: University of Nebraska - Lincoln; Term: Fall 2006;
Typology: Exams
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Monoprotic Weak Acid: Diprotic Weak acid: Isoionic point: Triprotic Weak acid: Debye-Hϋckel Equation:ckel Equation: Gas Constant : 8.314472 J/K.mol ^ ^ (^1305) 0 51 2 ^
. z log 2 K K^2 4 ( 1 )(F)(K ) [ H ] a^ a a (^) K F K K F K K H w 1 [ ]^211 K F K K F K K H w 1 [ ]^121 K F K K F K K H w 1 [ ]^211 K F K K F K K H w 2 [ ]^232
solution containing both Fe3+^ and Cu2+^ was titrated with EDTA and absorbance was measured at 745 nm (red). a. (2 points) What happens at point A? b. (2 points) What happens at point B? c. (3 points) A new technician is being trained using Fe3+^ and Cu2+^ standards. He is using a calibrated buret and obtains a similar titration curve as above, but his measured concentrations are systematically high. Why? d. (3 points) Describe one method that would correct the technician’s mistake.
Acetic acid acetate a. (5 points) What is the pH of this solution? b. (5 points) What is required to make the above solution a buffer with a pH of 3.0? c. (2 points) Is this an optimal pH for this buffer?