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The purity of a sample of K3Fe(CN)6 is determined using hydrodynamic voltammetry at a glassy carbon electrode. The following data were obtained for a set of calibration standards. A sample of impure K3Fe(CN)6 is prepared for analysis by diluting a 0.264 g portion to volume in a 100 mL volumetric flask. The limiting current for the sample is 444 μA. a) What type of calibration method is used? (Internal Standard, External Standard, or Standard Addition?) b) What is the purity of this sample of K3Fe(CN)6 (FW=329.25 g/mol)?

The purity of a sample of K3Fe(CN)6 is determined using hydrodynamic voltammetry at a glassy carbon electrode. The following data were obtained for a set of calibration standards. A sample of impure K3Fe(CN)6 is prepared for analysis by diluting a 0.264 g portion to volume in a 100 mL volumetric flask. The limiting current for the sample is 444 μA. a) What type of calibration method is used? (Internal Standard, External Standard, or Standard Addition?) b) What is the purity of this sample of K3Fe(CN)6 (FW=329.25 g/mol)?

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter22: The Chemistry Of The Transistion Elements
Section: Chapter Questions
Problem 17PS
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The purity of a sample of K3Fe(CN)6 is determined using hydrodynamic voltammetry at a glassy carbon electrode. The following data were obtained for a set of calibration standards.

A sample of impure K3Fe(CN)6 is prepared for analysis by diluting a 0.264 g portion to volume in a 100 mL volumetric flask. The limiting current for the sample is 444 μA.

a) What type of calibration method is used? (Internal Standard, External Standard, or Standard Addition?)

b) What is the purity of this sample of K3Fe(CN)6 (FW=329.25 g/mol)?

[KFe(CN)6] (mM) limiting current (uA) 2.0 4.0 127 252 6.0 376 8.0 500 10.0 624
Transcribed Image Text:[KFe(CN)6] (mM) limiting current (uA) 2.0 4.0 127 252 6.0 376 8.0 500 10.0 624
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