4- Balance each redox reaction and label the half reactions 5- What ar.docx

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This document discusses balancing a redox reaction and calculating concentrations from a solubility product constant. It balances the redox reaction: HBr + SO4-2 → Br2 + SO2 It then discusses dissolving aluminum chloride and calculating the equilibrium concentrations of Al3+ and Cl- ions using: a) The dissociation equation of AlCl3 b) The solubility product constant expression c) Calculating the concentrations as 1.286x10-8 M for both Al3+ and Cl- ions.

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4. Balance each redox reaction and label the half reactions 5. What are the equilibrium
concentrations of AP and Cl in a saturated solution of aluminum chloride, AICh, at 2592(Ksp 7.4
x 1031) a. Write the dissociation equation b. Solubility product constant (Ksp) expressions c.
Calculate Concentration of Al3 and Cl 9 -31
Solution
4.
HBr + SO4-2 ----------- SO2 + Br2
-1 +6 +4 0
The oxidation state of Br is increases from -1 to 0. The oxidation state of an element is increases
is called as oxidation. So Br undergoes Oxidation.
The oxidation state of S is decreases from +6 to +4. The oxidation state of an element is
decreases is called as reduction . so S undergoes reduction
Oxidation half reaction reduction half reaction
HBr ----------------- Br2 So4-2 ----------------- SO2
2 HBr ---------------- Br2 So4-2 ---------------- SO2 + 2H2O
2 HBr --------------- Br2 +2H+ So4-2 + 4 H+ --------------- SO2 + 2 H2O
2 HBr -------------- Br2 + 2 H+ + 2e- SO4-2 + 4 H+ + 2e- ----------------- SO2 + 2 H2O
[2 HBr -------------- Br2 + 2 H+ + 2e- ]x2
[SO4-2 + 4 H+ + 2e- ----------------- SO2 + 2 H2O]x2
2 HBr -------------- Br2 + 2 H+ + 2e-
SO4-2 + 4 H+ + 2e- ----------------- SO2 + 2 H2O

---------------------------------------------------------------------------
2 HBr + SO4-2 + 2 H+ ------------------ Br2 + SO2 + 2 H2O
-----------------------------------------------------------------------------------
This is the balanced equation
5).
a) AlCl3 ----------------- Al+3 + 3 Cl-
b) Ksp = [Al+3] [Cl-]^3
c) Ksp = [Al+3] [Cl-]^3
7.4x10^-31 = sx(3s)^3
7.4x10^-31 = 27S^4
S^4 = 7.4x10^-31/27= 0.274 x10^-31
S^4 = 2.74x10^-32
S= 1.286x10^-8
Concentration of Al+3= 1.286x10^-8M
concentration of Cl- = 1.286x10^-8M

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