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Chapter 17: Q39P (page 431)

What are the advantages of using a microelectrode for

voltametric measurements?

Short Answer

Expert verified

The benefits of microelectrodes in voltammetry techniques has been explained.

Step by step solution

01

Define voltammetry

In the electrochemical reactions the relation between current and voltage is noted and this technique is called voltammetry. A graph which represents current Vs voltage is called voltammogram.

02

Determine the benefits of microelectrodes in voltammetry techniques

  • Microelectrodes can be placed in small places and due to less ohmic loss which is handy in nonaqueous solutions.
  • Because of its small capacitance, it allows fast scanning of voltages which allows to the analysis of unstable species.
  • It also increases the analyte sensitivity due to low capacitance which provides low current.

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Most popular questions from this chapter

A0.3268-gunknown containing Pb(CH3CHOHCO2)2(leadLactate, FM 385.3) plus inert material was electrolyzed to produce 0.1111gofPbO2(FM239.2). Was the PbO2deposited at the anode or at the cathode? Find the weight percent of lead lactate in theUnknown.

(a) which voltage,V1orV2in the diagram is constant in controlled-potential electrolysis? Which are the working, auxiliary, and reference electrodes in the diagram?

(b) Explain how the Luggin capillary in Figure 17-4 measures the electric potential at the opening of the capillary.

Calculate the cathode potential (versus S.C.F.) needed to reduce cobalt(II) to 1.0μMin each of the following solutions. In each case, Co(s) is the product of the reaction. (Disregard any overpotential.)

(a) 0.10MHClO4

(b)0.10MC2O42-(Find the potential at which)[Co(C2O4)22-]=1.0μM

role="math" localid="1668354628300" Co(C2O4)22-+2c-→Co(s)+2C2O42-   E°=-0.474V

(c)0.10MFIJTA at pH 7.00(Find the potential at whichCo(HI)TA)2-∣=1.0μM.)

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.

Suppose that the diffusion current in a polarogram for reduction of Cd2+at a mercury electrode is14μAIf the solution containsof 25mLof0.50mMCd2+what percentage ofCd2+is reduced in the 3.4 min required to scan from-0.6to-1.2V?
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