Homework Help is Here – Start Your Trial Now!
Science
Chemistry
■ Vodacom 4G 20:13 21% := ACA470S Assignment Done Û ACA470S Assignment Due: 12 April 2024 Total: 30 Q1. Give reasons for the following practices in voltammetry and polarographic analysis. (6) (a) Degassing of the solution before analysis. (b) Use of large excess of an inert electrolyte 50 to 100 times more concentrated than analyte. (c) Utilisation of two or three electrodes for analysis. Q2. Explain why the following scenarios occur in voltammetry/polarography? (a) Why square wave voltammetry (SWV) is the commonest technique used? (b) Why is pulsed voltammetry more sensitive than linear sweep voltammetry? (c) Why is mercury electrode with its exceptional properties is not universally used? (9) Q3. Aluoride ISE immersed in 1 x 10-2 mol dm³ solution of sodium fluoride gives a potential of 35,2 mV and when it is immersed in a tooth paste solution it gives a potential of 30,2 mV. What is the concentration of fluoride ion in the toothpaste (4) Q4. The concentration of Cr (IV) in seawater was determined by polarography as follows; A 50.0 mL sample was analysed, resulting with a peak current of 0.886 microamps. After addition of a 5.00 microliter spike of 10.0 ppm Cr (IV) in the sample, a measured peak current of the resulting solution was 2.52 microamps. Calculate the ppm Cr (IV) in the sample of seawater. (5) Q5. What are the applications of the following stripping techniques. Explain your answer. (6) (a) Anodic stripping (b) Cathodic stripping (c) Absorptive stripping

■ Vodacom 4G 20:13 21% := ACA470S Assignment Done Û ACA470S Assignment Due: 12 April 2024 Total: 30 Q1. Give reasons for the following practices in voltammetry and polarographic analysis. (6) (a) Degassing of the solution before analysis. (b) Use of large excess of an inert electrolyte 50 to 100 times more concentrated than analyte. (c) Utilisation of two or three electrodes for analysis. Q2. Explain why the following scenarios occur in voltammetry/polarography? (a) Why square wave voltammetry (SWV) is the commonest technique used? (b) Why is pulsed voltammetry more sensitive than linear sweep voltammetry? (c) Why is mercury electrode with its exceptional properties is not universally used? (9) Q3. Aluoride ISE immersed in 1 x 10-2 mol dm³ solution of sodium fluoride gives a potential of 35,2 mV and when it is immersed in a tooth paste solution it gives a potential of 30,2 mV. What is the concentration of fluoride ion in the toothpaste (4) Q4. The concentration of Cr (IV) in seawater was determined by polarography as follows; A 50.0 mL sample was analysed, resulting with a peak current of 0.886 microamps. After addition of a 5.00 microliter spike of 10.0 ppm Cr (IV) in the sample, a measured peak current of the resulting solution was 2.52 microamps. Calculate the ppm Cr (IV) in the sample of seawater. (5) Q5. What are the applications of the following stripping techniques. Explain your answer. (6) (a) Anodic stripping (b) Cathodic stripping (c) Absorptive stripping

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
See similar textbooks
icon
Related questions
Question
■ Vodacom 4G 20:13 21% := ACA470S Assignment Done Û ACA470S Assignment Due: 12 April 2024 Total: 30 Q1. Give reasons for the following practices in voltammetry and polarographic analysis. (6) (a) Degassing of the solution before analysis. (b) Use of large excess of an inert electrolyte 50 to 100 times more concentrated than analyte. (c) Utilisation of two or three electrodes for analysis. Q2. Explain why the following scenarios occur in voltammetry/polarography? (a) Why square wave voltammetry (SWV) is the commonest technique used? (b) Why is pulsed voltammetry more sensitive than linear sweep voltammetry? (c) Why is mercury electrode with its exceptional properties is not universally used? (9) Q3. Aluoride ISE immersed in 1 x 10-2 mol dm³ solution of sodium fluoride gives a potential of 35,2 mV and when it is immersed in a tooth paste solution it gives a potential of 30,2 mV. What is the concentration of fluoride ion in the toothpaste (4) Q4. The concentration of Cr (IV) in seawater was determined by polarography as follows; A 50.0 mL sample was analysed, resulting with a peak current of 0.886 microamps. After addition of a 5.00 microliter spike of 10.0 ppm Cr (IV) in the sample, a measured peak current of the resulting solution was 2.52 microamps. Calculate the ppm Cr (IV) in the sample of seawater. (5) Q5. What are the applications of the following stripping techniques. Explain your answer. (6) (a) Anodic stripping (b) Cathodic stripping (c) Absorptive stripping
Transcribed Image Text:■ Vodacom 4G 20:13 21% := ACA470S Assignment Done Û ACA470S Assignment Due: 12 April 2024 Total: 30 Q1. Give reasons for the following practices in voltammetry and polarographic analysis. (6) (a) Degassing of the solution before analysis. (b) Use of large excess of an inert electrolyte 50 to 100 times more concentrated than analyte. (c) Utilisation of two or three electrodes for analysis. Q2. Explain why the following scenarios occur in voltammetry/polarography? (a) Why square wave voltammetry (SWV) is the commonest technique used? (b) Why is pulsed voltammetry more sensitive than linear sweep voltammetry? (c) Why is mercury electrode with its exceptional properties is not universally used? (9) Q3. Aluoride ISE immersed in 1 x 10-2 mol dm³ solution of sodium fluoride gives a potential of 35,2 mV and when it is immersed in a tooth paste solution it gives a potential of 30,2 mV. What is the concentration of fluoride ion in the toothpaste (4) Q4. The concentration of Cr (IV) in seawater was determined by polarography as follows; A 50.0 mL sample was analysed, resulting with a peak current of 0.886 microamps. After addition of a 5.00 microliter spike of 10.0 ppm Cr (IV) in the sample, a measured peak current of the resulting solution was 2.52 microamps. Calculate the ppm Cr (IV) in the sample of seawater. (5) Q5. What are the applications of the following stripping techniques. Explain your answer. (6) (a) Anodic stripping (b) Cathodic stripping (c) Absorptive stripping
AI-Generated Solution
AI-generated content may present inaccurate or offensive content that does not represent bartleby’s views.
steps

Unlock instant AI solutions

Tap the button
to generate a solution

SEE SOLUTION
Similar questions
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS