In acidic medium is an oxidant as MnO2 + 4 h + + 2^ e - MN ^2 + + 2 H2O if the pH of solution degrees by 1 unit the electrode potential of the half cell Pt,MnO2 and Mn^2+ will change by
Answers
Answer:
The cell potential in Chapter 17.2 Galvanic Cells (+0.46 V) results from the difference in the electrical potentials for each electrode. While it is impossible to determine the electrical potential of a single electrode, we can assign an electrode the value of zero and then use it as a reference. The electrode chosen as the zero is shown in Figure 1 and is called the standard hydrogen electrode (SHE). The SHE consists of 1 atm of hydrogen gas bubbled through a 1 M HCl solution, usually at room temperature. Platinum, which is chemically inert, is used as the electrode. The reduction half-reaction chosen as the reference is
2
H
+
(
a
q
,
1
M
)
+
2
e
−
⇌
H
2
(
g
,
1
atm
)
E
∘
=
0
V
E° is the standard reduction potential. The superscript “°” on the E denotes standard conditions (1 bar or 1 atm for gases, 1 M for solutes). The voltage is defined as zero for all temperatures.
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