The metal solution that will deposit the highest mass of metal is Cu(NO₃).
Faraday’s First Law of Electrolysis states that “The mass of a substance deposited at any electrode is directly proportional to the amount of charge passed.” Mathematically it can be expressed as follows –
m ∝ Q
Where:
m = mass of a substance (in grams) deposited or liberated at an electrode.
Q = amount of charge (in coulombs) or electricity passed through it.
m=ZQ
Z is the proportionality constant. Its unit is grams per coulomb (g/C). It is also called the electrochemical equivalent. Z is the mass of a substance deposited at electrodes during electrolysis bypassing 1 coulomb of charge.
now mass deposited per coulomb of charge passed is inversional promotional to charge on the metal ion.
therefore since in Cu(NO₃) charge in Cu is lowest i.e. +1 , so mass deposited for it will be maximum
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Question: Using 1.0 a of current for 60 s, what metal solution will deposit the highest mass of metal?
depositing Cu from Cu(NO3)2
depositing Cu from CuNO3
depositing Fe from Fe(NO3)2
depositing Fe from Fe(NO3)3
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