For the following two redox equations, please show the following: a) H_2 SO_4 +

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

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