# Question 16.4: Coulometric Titration. A 2.000-mL volume containing 0.611 3 ...

Coulometric Titration

A 2.000-mL volume containing 0.611 3 mg of cyclohexene/mL is to be titrated in Figure 16-8. How much time is required for titration at a constant current of 4.825 mA?

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Question: 16.E.F

## 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 (±0.02 ) V and Pb^2+ gives a reduction wave at −0.40 (±0.02) V. It was first verified that the ratio of peak heights is proportional to the ratio of concentrations over ...

(a) Use the internal standard equation with X = [l...
Question: 16.E.G

## Consider the cyclic voltammogram of the Co^3+ compound 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 ...

We see two consecutive reductions. From the value ...
Question: 16.E.H

## 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 the residual H2O in the methanol. A suspension of 0.847 6 g of finely ground polymeric material in 25.00 mL of the same “dry” methanol required 63.16 C. Find the weight ...

Electricity required for $H_{2}O$ in ...
Question: 16.E.D

## Ions that react with Ag^+ can be determined electrogravimetrically by deposition on a silver working anode: Ag(s) + X^− → AgX(s) + e^− (a) What will be the final mass of a silver anode used to electrolyze 75.00 mL of 0.023 80 M KSCN if the initial mass of the anode is 12.463 8 g? (b) At what ...

(a) 75.00 mL of 0.023 80 M KSCN = 1.785 mmol of [l...
Question: 16.E.E

## Chlorine has been used for decades to disinfect drinking water. An undesirable side effect of this treatment is reaction with organic impurities to create organochlorine compounds, some of which could be toxic. Monitoring total organic halide (designated TOX) is required for many water providers. A standard procedure for TOX is to pass water through activated ...

The corrected coulometric titration time is 387 − ...
Question: 16.E.A

## A dilute Na2SO4 solution is to be electrolyzed with a pair of smooth Pt electrodes at a current density of 100 A/m² and a current of 0.100 A. The products are H2(g) and O2(g) at 1.00 bar. Calculate the required voltage if the cell resistance is 2.00 Ω and there is no concentration polarization. ...

Cathode:  2H^{+} + 2e^{−} \rightleftharpoon...
Question: 16.E.B

## (a) At what cathode potential will Sb(s) deposition commence from 0.010 M SbO^+ solution at pH 0.00? Express this potential versus S.H.E. and versus Ag | AgCl. SbO^+ + 2H^+ + 3e^− ⇔ Sb(s) + H2O  E° = 0.208 V (b) What percentage of 0.10 M Cu^2+ could be reduced electrolytically to Cu(s) before 0.010 ...

(a) To electrolyze 0.010 M $SbO^{+}$ ...
Question: 16.E.C

## Calculate the cathode potential (versus S.C.E.) needed to reduce cobalt(II) to 1.0 μM in each of the following solutions. In each case, Co(s) is the product of the reaction. (a) 0.10 M HClO4 (b) 0.10 M C2O4^2− (Find the potential at which [Co(C2O4)2^2−] = 1.0 μM.) Co(C2O4)2^2− + 2e^− ⇔ Co(s) + ...

(a)  Co^{2+} + 2e^{−} \rightleftharpoons Co...
Question: 16.5

## Standardization and Blank Correction in Karl Fischer Titration. It is routine to standardize Karl Fischer reagents, or even a coulometer, with a standard such as lincomycin hydrochloride monohydrate, which contains 3.91 wt% H2O. The coulometer is run until the end point is reached, indicating that ...

For lincomycin, we observe ~20.7 μg more H_...
If 99.99% of $Cu^{2+}$ were reduced, ...