During the functioning of Galvanic cells like Daniel cell the mass of cathode
Answers
Answer:
Galvanic cells, also known as voltaic cells, are electrochemical cells in which spontaneous oxidation-reduction reactions produce electrical energy. In writing the equations, it is often convenient to separate the oxidation-reduction reactions into half-reactions to facilitate balancing the overall equation and to emphasize the actual chemical transformations.
Consider what happens when a clean piece of copper metal is placed in a solution of silver nitrate (Figure 1). As soon as the copper metal is added, silver metal begins to form and copper ions pass into the solution. The blue color of the solution on the far right indicates the presence of copper ions. The reaction may be split into its two half-reactions. Half-reactions separate the oxidation from the reduction, so each can be considered individually.
oxidation:
Cu
(
s
)
Cu
2
+
(
a
q
)
+
2
e
−
reduction:
2
×
(
Ag
+
(
a
q
)
+
e
−
Ag
(
s
)
)
or
2
Ag
+
(
a
q
)
+
2
e
−
⟶
Ag
(
s
)
overall:
2
Ag
+
(
a
q
)
+
Cu
(
s
)
2
Ag
(
s
)
+
Cu
2
+
(
a
q
)
The equation for the reduction half-reaction had to be doubled so the number electrons “gained” in the reduction half-reaction equaled the number of electrons “lost” in the oxidation half-reaction.
Explanation: