Balance these equations for redox reactions in basic solution. a. MnO 2 ( s ) +CIO 3 → MnO 4 +CI b. Fe ( OH ) 3 ( s ) +OCI → FeO 4 2 +CI c. CIO 2 → CIO 3 +CI d. Ag ( s ) +CrO 4 2 → Ag + +Cr ( OH ) 3 ( s )
Balance these equations for redox reactions in basic solution. a. MnO 2 ( s ) +CIO 3 → MnO 4 +CI b. Fe ( OH ) 3 ( s ) +OCI → FeO 4 2 +CI c. CIO 2 → CIO 3 +CI d. Ag ( s ) +CrO 4 2 → Ag + +Cr ( OH ) 3 ( s )
Solution Summary: The author explains how to balance equations for redox reactions in acidic aqueous solutions by the half-equation.
Balance these equations for redox reactions in basic solution. a.
MnO
2
(
s
)
+CIO
3
→
MnO
4
+CI
b.
Fe
(
OH
)
3
(
s
)
+OCI
→
FeO
4
2
+CI
c.
CIO
2
→
CIO
3
+CI
d.
Ag
(
s
)
+CrO
4
2
→
Ag
+
+Cr
(
OH
)
3
(
s
)
Method Method Redox reactions are generally balanced using two processes. The first method is based on the redox reaction’s division into two reactions where one is involved in oxidation and the other in reduction (half reaction method) and the second one is based on the reducing and oxidizing molecule’s oxidation number variation (oxidation number method).
There is an instrument in Johnson 334 that measures total-reflectance x-ray fluorescence (TXRF) to do elemental analysis (i.e., determine what elements are present in a sample). A researcher is preparing a to measure calcium content in a series of well water samples by TXRF with an internal standard of vanadium (atomic symbol: V). She has prepared a series of standard solutions to ensure a linear instrument response over the expected Ca concentration range of 40-80 ppm. The concentrations of Ca and V (ppm) and the instrument response (peak area, arbitrary units) are shown below. Also included is a sample spectrum. Equation 1 describes the response factor, K, relating the analyte signal (SA) and the standard signal (SIS) to their respective concentrations (CA and CIS).
Ca, ppm
V, ppm
SCa, arb. units
SV, arb. units
20.0
10.0
14375.11
14261.02
40.0
10.0
36182.15
17997.10
60.0
10.0
39275.74
12988.01
80.0
10.0
57530.75
14268.54
100.0…
A mixture of 0.568 M H₂O, 0.438 M Cl₂O, and 0.710 M HClO are enclosed in a vessel at 25 °C.
H₂O(g) + C₁₂O(g) = 2 HOCl(g)
K = 0.0900 at 25°C
с
Calculate the equilibrium concentrations of each gas at 25 °C.
[H₂O]=
[C₁₂O]=
[HOCI]=
M
Σ
M
What units (if any) does the response factor (K) have? Does the response factor (K) depend upon how the concentration is expressed (e.g. molarity, ppm, ppb, etc.)?
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