For the following two redox equations, please show the following: a) H_2 SO_4 +
ID: 518589 • Letter: F
Question
For the following two redox equations, please show the following: a) H_2 SO_4 + HI rightarrow I_2 + SO_2 (acidic solution) i. Write the oxidation numbers for each element in the equation. ii. Write the oxidation half reaction and the reduction half reaction. iii. Write the complete and balanced equation. b) Cl_2 + OH^1- rightarrow Cl^1- + ClO_3^1- (basic solution) i. Write the oxidation numbers for each element in the equation ii. Write the oxidation half reaction and the reduction half reaction and balanced equation.Explanation / Answer
Question 2
a)
H2SO4 -->
H = +1
O = -2
S = +6
HI -->
H = +1
I = -1
I2 -->
I = 0
SO2 -->
O = -2
S = +4
b)
oxidation hal reaction
H2SO4 = SO2
HI = I2
balance I
H2SO4 = SO2
2HI = I2
balance O
H2SO4 = SO2 + 2H2O
2HI = I2
balance H
2H+ + H2SO4 = SO2 + 2H2O
2HI = I2 + 2H+
balance charges
2e- + 2H+ + H2SO4 = SO2 + 2H2O
2HI = I2 + 2H+ + 2e-
then
redox reaction:
2e- + 2H+ + H2SO4 = SO2 + 2H2O
oxidation reaction
2HI = I2 + 2H+ + 2e-
c)
complete reactions
2e- + 2H+ + H2SO4 = SO2 + 2H2O
2HI = I2 + 2H+ + 2e-
add all
2HI + 2e- + 2H+ + H2SO4 = SO2 + 2H2O + I2 + 2H+ + 2e-
cancel common terms
2HI + H2SO4 = SO2 + 2H2O + I2