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Chapter 17: Q14P (page 428)

Explain how amperometric end-point detection in Figure17-9 operates.

Short Answer

Expert verified

cathodeBr2+2e-→2Br-anode2Br-→Br2+2e-

Step by step solution

01

Amperometric method:

End-point detection of complexometric titrations of metal ions in unbuffered solutions with disodium ethylenediaminetetraacetate is proposed as an amperometric technique (Na2H2Y). It is based on the employment of a platinum disc microelectrode as a sensor for detecting the hydrogen ions supplied during the titration.

02

Find amperometric end-point detection:

Br2generated at the Pt anode reacts with cyclohexene. When cyclohexene is consumed, the concentration of increases, signaling the end of the reaction. The increase in Br2concentration is detected by measuring the current between the two detector electrodes:

cathode ;Br2+2e-→2Br-anode2Br-→Br2+2e-

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Most popular questions from this chapter

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

17-17. The experiment in Figure 17 - 9 required 5.32mA for 864s for complete reaction of a5.00 - mLaliquot of unknown cyclohexene solution.

(a) How many moles of electrons passed through the cell?

(b) How many moles of cyclohexene reacted?

(c) What was the molarity of cyclohexene in the unknown?

17-19. In the Figure, 17-11, 2.00nmol fructose was introduced at the time of the arrow. How many electrons are lost in the oxidation of one molecule of fructose? Compare the theoretical number of coulombs with the observed number of coulombs for complete oxidation of the sample.

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