Respuesta :
The mass percentage of silver in the salt is 63.58 %
What is Electrolysis ?
Electrolysis refers to the decomposition of a substance by an electric current.
It is a technique that uses direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction.
Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.
Ag⁺ + e⁻ --> Ag
[tex]\rm W_{Ag} = Z \times I\times t\\\\\\\rm W_{Ag} = \dfrac{Z \times I\times t\\}{96500}\\\\\\W_{Ag} = Mass \; of\; Ag \; plate\\\\\\\rm W_{Ag} = \dfrac{108 \times 2.82\times 695\\}{96500}\\\\\\W_{Ag} = 2.193 g \\\\\\Mass \;percentage\; of \;silver\; in\; salt = \dfrac{mass \;of\;Ag}{Total \;mass\;of\;salt}\times 100\\\\\\\\=\dfrac{2.193}{3.45} \times 100\\\\\\=63.58 \%\\[/tex]
Z = Electrochemical Equivalent.
Z = atomic weight/nF
n = no. of electron, F = 96500 , Faraday's Constant
Chemical formula of the salt will be determined as
moles of Ag = moles of AgX
[tex]\rm Molecular \; weight \; of \; Ag = 108\\\\\\\rm\dfrac{2.193}{108}= \dfrac{3.45}{M_{AgX}}\\\\\\\\M_{AgX} =170 \;g/mol\\\\\\\\M_{AgX} = M_{Ag} + M_{X}\\\\\\\\170= 108 + M_{X}\\\\\\\\M_{X}= 170-108 = 62\\\\[/tex]
and therefore the salt is AgNO₃ .
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