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Chapter 17: Q14P (page 428)

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

Short Answer

Expert verified

$cathode B r_{2} + 2 e^{-} 鈫� 2 B r^{-} a n o d e 2 B r^{-} 鈫� B r_{2} + 2 e^{-}$

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 $(Na 2 H 2 Y)$ . 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:

${Br}_{2}$ generated at the Pt anode reacts with cyclohexene. When cyclohexene is consumed, the concentration of increases, signaling the end of the reaction. The increase in ${Br}_{2}$ concentration is detected by measuring the current between the two detector electrodes:

cathode ; $B r_{2} + 2 e^{-} 鈫� 2 B r^{-} a n o d e 2 B r^{-} 鈫� B r_{2} + 2 e^{-}$

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Most popular questions from this chapter

Electroplating efficiency. $^{56}$ Nickel was electrolytically plated onto a carbon electrode from a bath containing $290 g / {LNiSO}_{4} . 6 H_{2} O, 30 g / LB {(OH)}_{3}$ androle="math" localid="1654763379590" $8 g / LNaCl at - 1.2 V$ vs $Ag |\begin{matrix} AgCl \end{matrix}|$ The most important side reaction is reduction of $H^{+} {toH}_{2}$ .In one experiment, a carbon electrode weighing $0.4775 g$ before deposition weighedrole="math" localid="1654763622546" $0.4798 g after 8.82 C$ had passed through the circuit. What percentage of the current went into the reaction ${Ni}^{2} + 2 e^{-} 鈫� Ni (s) ?$

${cd}^{2 +}$ was used as an internal standard in the analysis of ${Pb}^{2 +}$ by square wave polarography. ${Cd}^{2 +}$ gives a reduction wave at -0.60 V and ${Pb}^{2 +}$ gives a reduction wave at 鈥�0.40 V. It was first verified that the ratio of peak heights is proportional to the ratio of concentrations over the whole range employed in the experiment. Here are results for known and unknown mixtures:

The unknown mixture was prepared by mixing $25.00 (卤 0.05) mL$ of unknown (containing only ${Pb}^{2 +}$ ) plus $10.00 (卤 0.05) mL$ of $3.23 (卤 0.01) 脳 10^{- 4} {MCd}^{2 +}$ and diluting to $50.00 (卤 0.05) mL$ .

(a) Disregarding uncertainties, find $[{Pb}^{2 +}]$ in the undiluted unknown.

(b) Find the absolute uncertainty for the answer to part (a).

Will(cathode) =0.19 Vreduce $0.10 M {SbO}^{+}$ at pH 2 by the reaction ${SbO}^{+} + 2 H^{+} + 3 e^{-} 鈬� Sb (s) + H_{2} O, E^{掳} = 0.208 V$ ?

Suppose that the diffusion current in a polarogram for reduction of ${Cd}^{2 +}$ at a mercury electrode is $14 渭础$ If the solution containsof 25mLof $0.50 {mMCd}^{2 +}$ what percentage of ${Cd}^{2 +}$ is reduced in the 3.4 min required to scan from $- 0.6 to - 1.2 V$ ?

How many hours are required for 0.100 mol of electrons to flow through a circuit if the current is 1.00 A?

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