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Chapter 17: Q33P (page 430)

Explain what is done in anodic stripping voltammetry. Why is stripping the most sensitive voltammetric technique?

Short Answer

Expert verified

The process of anodic stripping voltammetry follows electro reduction, voltage direction and oxidation. As the analyte is concentrated from a dilute solution therefore, stripping is more effective than the voltammetric technique was given.

Step by step solution

01

Introduction

The process of anodic stripping voltammetry.

- By electro reduction into a thin film of mercury, the analyte is concentrated in stripping.

- While changing the voltage's direction the electroactive species is stripped off from the electrode.

- This leads to oxidation which is proportional to the deposited analyte.

- The effectiveness of stripping is due to the analyte getting concentrated in a dilute solution.

02

 Explanation.

In stripping analysis, analyte from a dilute solution is concentrated at working electrode. The potential becomes more positive because of oxidation, and the peak current measured during oxidation is proportional to the concentration of analyte that was deposited. As the analyte is concentrated from a dilute solution therefore, stripping is more effective than the voltametric technique was given. Analysis is more sensitive towards longer concentration period..

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Most popular questions from this chapter

Ti3+ is to be generated in 0.10MHClO4 for coulometric reduction of azobenzene.

TiO2++2H++e−⇌Ti3++H2OE0=0.100V4Ti3++C6H5N=NC6H5+4H2O→2C6H5NH2+4TiO2++4H+

At the counter electrode, water is oxidized, and \(\mathrm{O}_{2}\) is liberated at a pressure of \(0.20\) bar. Both electrodes are made of smooth Pt, and each has a total surface area of 1.00cm2. The rate of reduction of the azobenzene is 25.9nmol/s , and the resistance of the solution between the generator electrodes is 52.4Ω.

  1. Calculate the current density (A/m2)at the electrode surface. Use Table 17-1 to estimate the overpotential for O2liberation.
  2. Calculate the cathode potential (versus S.H.E.) assuming that role="math" localid="1668356673323" [TiO2+surface]=[TiO2+]bulk=0.050Mand [Ti3+]surface=0.10M.
  3. Calculate the anode potential (versus S.H.E.).
  4. What should the applied voltage be?

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cathode:2H2O+2e-⇌H2(g)+20H-Anode:H2O⇌12O2(g)+2H++2e-

Calculate the standard voltageE°needed to decompose water into its elements by electrolysis. What does the word standard mean in this question?

A solution of Sn2+is to be electrolyzed to reduce the Sn2+to Sn(s). Calculate the cathode potential (versus S.H.E.) needed to reduce[Sn2+]to1.0×10-8Mif no concentration polarization occurs. What would be the potential versus S.C.E. instead of S.H.E? Would the potential be more positive or more negative if concentration polarization occurred?

The drug Librium gives a polarographic wave withE1/2=-0.265V(versus S.C.E.) in 0.05MH2SO4. A 50.0 - Mlsample containing Librium gave a wave height of0.37μA. When 2.00mLof 3.00mMLibrium in0.05MH2SO4were added to the sample, the wave height increased to0.80μA. Find the molarity of Librium in the unknown.
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