Questions from General Chemistry

Q: A 40.00-mL aliquot of 0.05000 M

A 40.00-mL aliquot of 0.05000 M HNO2 is diluted to 75.00 mL and titrated with 0 0800 MCe4+ The pH of the solution is maintained at 1.00 throughout the titration; the formal potential of the cerium sys...

Q: The titration of Fe(II) with permanganate yields a particularly

The titration of Fe(II) with permanganate yields a particularly asymmetrical titration curve because of the different number of electrons involved in the two half-reactions. Consider the titration of...

Q: The Na+ concentration of a solution was determined by measurements with

The Na+ concentration of a solution was determined by measurements with a sodium ion-selective electrode. The electrode system developed a potential of −0.2462 V when immersed in 10.0 mL of the soluti...

Q: The F− concentration of a solution was determined by measurements with

The F− concentration of a solution was determined by measurements with a liquid-membrane electrode. The electrode system developed a potential of 0.5021 V when immersed in 25.00 mL of the sample, and...

Q: A lithium ion-selective electrode gave the potentials given next for

A lithium ion-selective electrode gave the potentials given next for the following standard solutions of LiCl and two samples of unknown concentration: (a) Construct a calibration curve of potential...

Q: A fluoride electrode was used to determine the amount of fluoride in

A fluoride electrode was used to determine the amount of fluoride in drinking water samples. The results given in the table that follows were obtained for four standards and two unknowns. Constant ion...

Q: You need to choose between determining an analyte by measuring an electrode

You need to choose between determining an analyte by measuring an electrode potential or by performing a titration. Explain which you would choose if you needed to know (a) The absolute amount of the...

Q: The phenol content of water downstream from a coking furnace was determined

The phenol content of water downstream from a coking furnace was determined by coulometric analysis. A 100-mL sample was rendered slightly acidic, and an excess of KBr was introduced. To produce Br2 f...

Q: At a potential of −1.0 V (versus SCE

At a potential of −1.0 V (versus SCE), CCl4 in methanol is reduced to CHCl3 at a mercury cathode: 2CCl4 + 2H+ + 2e- + 2Hg(l) ( 2CHCl3 + Hg2Cl2(s) At -1.80 V, the CHCl3 further reacts...

Q: Construct a coulometric titration curve of 100.0 mL of a

Construct a coulometric titration curve of 100.0 mL of a 1 M H2SO4 solution containing Fe(II) titrated with Ce(IV) generated from 0.075 M Ce(III). The titration is monitored by potentiometry. The init...