a) 4OH-(aq) $\rightarrow$ 4e + 2H2O(l) + O2(g)
b) Q = It
= 5 x 3 x 60 x 60 = 54000 C
Mass of silver deposited = $\frac{108\times 54000}{96500}$
= 60.44 g
johnmulu answered the question on February 16, 2017 at 06:55
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When brine is electrolysed using inert electrodes, chlorine gas is liberated at the anode instead of oxygen. Explain this observation and name the product formed at the cathode.
(Solved)
a) When brine is electrolysed using inert electrodes, chlorine gas is liberated at the anode instead of oxygen. Explain this observation.
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Date posted:
February 16, 2017
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Answers (1)
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February 16, 2017
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February 16, 2017
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When a current of 0.82 A was passed for 5 hours through an aqueous solution of metal Z, 2.65 g of the metal were deposited....
(Solved)
When a current of 0.82 A was passed for 5 hours through an aqueous solution of metal Z, 2.65 g of the metal were deposited. (1 Faraday = 96500 Coulombs: Relative atomic mass of Z = 52)
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(c) Write the equation for the formation of ion of P.
Date posted:
February 16, 2017
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Answers (1)
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Brine usually contains soluble calcium and magnesium salts. Explain how sodium carbonate is used to purify brine
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Date posted:
February 16, 2017
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Answers (1)
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During purification of copper by electrolysis, 1.48 g of copper were deposited when current was passed through aqueous copper (II) sulphate for 2$\frac{1}{2}$ hours. Calculate the amount of current used. (Cu = 63.5; 1 F = 96500 C
(Solved)
During purification of copper by electrolysis, 1.48 g of copper were deposited when current was passed through aqueous copper (II) sulphate for 2$\frac{1}{2}$ hours. Calculate the amount of current used. (Cu = 63.5; 1 F = 96500 C).
Date posted:
February 16, 2017
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Answers (1)
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An element P has a relative atomic mass of 88. When a current of 0.5 amperes was passed through the fused chloride of P for 32 minutes and 10 seconds, 0.44 g of P were deposited at the cathode.
(Solved)
An element P has a relative atomic mass of 88. When a current of 0.5 amperes was passed through the fused chloride of P for 32 minutes and 10 seconds, 0.44 g of P were deposited at the cathode. Determine the charge on an ion of P.
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Date posted:
February 16, 2017
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Answers (1)
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When a current of 1.5 amperes was passed through a cell containing M3+ ions of metal M for 15 minutes, the mass of the cathode increases by 0.26 g. (1 Faraday = 96500 coulombs).
(Solved)
When a current of 1.5 amperes was passed through a cell containing M3+ ions of metal M for 15 minutes, the mass of the cathode increases by 0.26 g. (1 Faraday = 96500 coulombs).
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Date posted:
February 16, 2017
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Answers (1)
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Give reason why aluminium metal would protect iron from rusting better than zinc metal
(Solved)
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Date posted:
February 16, 2017
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Aqueous potassium sulphate was electrolyzed using platinum electrodes in a cell......
(Solved)
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Date posted:
February 16, 2017
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Answers (1)
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(Solved)
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Date posted:
February 16, 2017
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Answers (1)
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Why is it not advisable to use aqueous sodium chloride solution as the salt bridge in the electrochemical cell formed between half cells..
(Solved)
Explain why it is not advisable to use aqueous sodium chloride solution as the salt bridge in the electrochemical cell formed between half cells, Pb2+(aq)/Pb(s) Eo = - 0.13 V and Cu2+(aq)/Cu(s) Eo = + 0.34 V.
Date posted:
February 16, 2017
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Answers (1)
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(Solved)
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Date posted:
February 16, 2017
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Answers (1)
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(Solved)
State the Le Chatelier's principle.
Date posted:
February 15, 2017
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Answers (1)
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(Solved)
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Date posted:
February 15, 2017
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Answers (1)
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State and explain how the rate of reaction between zinc granules and steam can be increased
(Solved)
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Date posted:
February 15, 2017
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Answers (1)
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A dynamic equilibrium between dichromate and chromate ions is established as shown in the equation below
(Solved)
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Date posted:
February 15, 2017
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Answers (1)
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The decomposition of calcium carbonate can be represented by the equation:
(Solved)
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Date posted:
February 15, 2017
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Answers (1)
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When bromine gas reacts with aqueous sodium hydroxide, the equilibrium represented by the equation:
(Solved)
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Date posted:
February 15, 2017
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Answers (1)
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(Solved)
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Date posted:
February 15, 2017
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Answers (1)