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Problem- Purification of copper can be acheived by electrorefining copper from an impure copper anode onto a pure copper cathode in an electrolytic cell. How many hours will it take to plate 12.0 kg of copper onto the cathode if the current passed through the cell is held constant at 35.0 A? Assume the copper in the electrolytic solution is present as Cu2.
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A 100.0 mL aliquot of 0.100 M weak base B (pKb = 5.000) was titrated with 1.00 M HClO4. Find the pH after 1.3 mL of acid is added. Then Find the pH after 11.1 mL of acid is added.
Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e- -> Zn(s) For a large batch of nails, a manufacturer needs to plate a total zinc mass of 1.60 kg on the surface to get adequat..
toothpaste contains 0.24% by mass sodium flouride used to prevent dental cavities. One tube contains 119g of toothpaste. How many moles of NaF are in the tube?
can the solubilities of formate pbcho22 pkso 6.70 pka 3.75 and copper iodate cuio32 pkso 7.13 pka 0.79 be made
Describe how you would prepare 1.00 L of an effective buffer solution at each of the following pH values. Specify (i) which acid or base you would use (in each case, use 0.100 mol) and (ii) whether you would add HCl or NaOH, and how much. (a) pH =..
An open end manometer constructed from a U-shaped tube was operated using an oil which has a density of 1.088 g ml-1. In a particular measurement, the level in the end connected to the gas manifold, on which the experiment was being conducted, mea..
Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the concentration of Ca2 in this solution if [OH-] is somehow fixed at 4.90 × 10-6 M
A 40-cuft tank is filled with air at 14.7psia and 80 F, The tank also contains a 15-lb block of dry ice solid CO2, specific gravity of 1.53 based on water. After the dry ice sublimes, the temperature is 30F. Explain what is the pressure? Presume i..
What is the energy uncertainty associated with a short pulse of laser light that lasts for only 4.8 femtoseconds (fs)? Suppose the low energy end of the pulse had a wavelength of 727 .
describe three distinctly different reactions of furan which confirm the relatively smaller aromatic resonance stabilization of furan compared with thiophene and pyrrole (reactions which lead to non aromatic products)
The absorption spectrum of a solution that contains chromium (III) ions demonstrate two maxima one at about 400nm and the other at about575nm. Explain what color light is associated with electromagnetic radiation of these wavelengths
Comment of the fact that erythro-2,3-dibromo-3-phenylpropanoic acid undergoes elimination by an E1 pathway in water solvent, but by and E2 pathway when acetone is used as the solvent.
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