Questions from General Chemistry

Q: Calculate the time needed for a constant current of 0.8510

Calculate the time needed for a constant current of 0.8510 A to deposit 0.250 g of Co(II) as (a) Elemental cobalt on the surface of a cathode. (b) Co3O4 on an anode. Assume 100% current efficiency for...

Q: Calculate the time needed for a constant current of 1.25

Calculate the time needed for a constant current of 1.25 A to deposit 0.550 g of (a) Tl(III) as the element on a cathode. (b) Tl(I) as Tl2O3 on an anode. (c) Tl(I) as the element on a cathode.

Q: A 0.1330-g sample of a purified organic acid

A 0.1330-g sample of a purified organic acid was neutralized by the hydroxide ion produced in 5 minutes and 24 s by a constant current of 300 mA. Calculate the equivalent mass of the acid in grams.

Q: The CN− concentration of 10.0 mL of a plating

The CN− concentration of 10.0 mL of a plating solution was determined by titration with electrogenerated hydrogen ion to a methyl orange end point. A color change occurred after 3 minutes and 55 s wit...

Q: Electrolytically generated I2 was used to determine the amount of H2S in

Electrolytically generated I2 was used to determine the amount of H2S in 100.0 mL of brackish water. Following addition of excess KI, a titration at a constant current of 56.8 mA required 9.13 minutes...

Q: The nitrobenzene in 300 mg of an organic mixture was reduced to

The nitrobenzene in 300 mg of an organic mixture was reduced to phenylhydroxylamine at a constant potential of −0.96 V (versus SCE) applied to a mercury cathode: The sample was diss...

Q: Briefly distinguish between (a) Concentration polarization and kinetic polarization

Briefly distinguish between (a) Concentration polarization and kinetic polarization. (b) A reference electrode and a working electrode. (c) Diffusion and migration. (d) An ampere and a coulomb. (e) Th...

Q: Why is it necessary for the glass in the membrane of a

Why is it necessary for the glass in the membrane of a pH-sensitive electrode to be appreciably hygroscopic?

Q: Briefly define (a) Ohmic potential. (b

Briefly define (a) Ohmic potential. (b) Overvoltage. (c) Controlled-potential electrolysis. (d) Coulometric titration. (e) Current efficiency. (f) Potentiostat.

Q: Describe three mechanisms responsible for the transport of dissolved species to and

Describe three mechanisms responsible for the transport of dissolved species to and from an electrode surface.