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Tuesday, May 11, 2021
During electro refining of Cu how much time is needed to produce 250g Cu on the cathode if the current is kept at 11 A?
Given that current (i) = 11 A = 11 cycle/second
Number of moles of copper deposited on cathode is
Related Questions:
(1) A current of 2.68 ampere is passed for one hour through an aqueous solution of copper sulphate using copper electrodes. Calculate the change in the mass cathode and that of anode. ( atomic mass of copper is 63.5 u).
(3) On passing 3 faradays of electricity through three electrolytic cells connect in series containing Ag+ , Ca+2 and Al+3 ions respectively , the molar ratio in which three metals ions are liberated at the electrode is
Zn amalgam is prepared by electrolysis of aqueous ZnCl2 using 9 gram Hg cathode. How much current is to be passed through ZnCl2 solution for 1000 seconds to prepare of Zn amalgam with 20% weight? (Atomic wt, Zn = 65.4 g)
Let “x “gram of Zn deposited on 9 gm of Hg:
Related Questions:
(1) A current of 2.68 ampere is passed for one hour through an aqueous solution of copper sulphate using copper electrodes. Calculate the change in the mass cathode and that of anode. ( atomic mass of copper is 63.5 u).
(3) On passing 3 faradays of electricity through three electrolytic cells connect in series containing Ag+ , Ca+2 and Al+3 ions respectively , the molar ratio in which three metals ions are liberated at the electrode is
Monday, May 10, 2021
1 M aqueous solution of NaCl undergo electrolysis if 50 mA current is passed for 12 hours assume current efficiency is 25%. The total volume of gas produced at standard state is. NaCl (aq) solution undergoes electrolysis as:
NaCl(aq) àNa+ + Cl-
H2O à
H+ + HO-
Reactions:
At cathode: 2H+ +
2e-à
H2(g)
At anode: 2Cl-à Cl2(g) + 2e-
Related Questions:
(1) A current of 2.68 ampere is passed for one hour through an aqueous solution of copper sulphate using copper electrodes. Calculate the change in the mass cathode and that of anode. ( atomic mass of copper is 63.5 u).
(3) On passing 3 faradays of electricity through three electrolytic cells connect in series containing Ag+ , Ca+2 and Al+3 ions respectively , the molar ratio in which three metals ions are liberated at the electrode is
How long has a current of 3 ampere to be applied through a solution of silver nitrate to coat a metal surface of 80 cm2 with 0.005 cm thick layer density of silver is 10.5g/cm3.
Given Area = 80 cm3
Thickness = 0.0005 cm
Density= 10.5 gl cm3
Thus Mass of silver deposited on cathode is = 80 cm3 x 0.0005
cm x10.5 gm/cm3= 0.42 gm
Related Questions:
(1) A current of 2.68 ampere is passed for one hour through an aqueous solution of copper sulphate using copper electrodes. Calculate the change in the mass cathode and that of anode. ( atomic mass of copper is 63.5 u).
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