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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

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?

In a coulometric Karl Fischer water analysis, 25.00 mL of pure "dry" methanol required 4.23 C to generate enough I2 to react with residual H2O in the methanol. A suspension of 0.8476 g of finely ground polymeric material in 25.00 mL of the same "dry" methanol required 63.16 C. Find the wt %H2O in the polymer.

Consider the cyclic voltammogram of the Co3+compoundrole="math" localid="1663646447735" Co(B9C2H11)2- . Suggest a chemical reaction to account for each wave. Are the reactions reversible? How many electrons are involved in each step? Sketch the sampled current and square wave polarograms expected for this compound.

Cyclic voltammogramofrole="math" localid="1663646461802" Co(B9C2H11)2- . [Data from W. E. Geiger, Jr., W. L. Bowden, and N. El Murr, "An Electrochemical Study of the Protonation Site of the Cobaltocene Anion and of Cyclopentadienylcobalt(I) Dicarbollides," Inorg. Chem. 1979,18,2358.]

What is the purpose of the Nafion the membrane in Figure 17-33

The chlor-alkali process 54in which seawater is electrolyzed to make CI2 andNaOH, is the second most important commercial electrolysis, behindAIproduction.

Anode: CI-→12CI2+e-

HgCathode:Na++H2O+e-→NaOH+12H2

The Nafion membrane (page 421) used to separate the anode and cathode compartments resists chemical attack. Its anionic side chains permit conduction ofNa+ , but not anions. The cathode compartment contains pure water, and the anode compartment contains seawater from which Ca2+ and Mg2+ have been removed. Explain how the membrane allows NaOH to be formed free ofNaCI.
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