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## Group Activity: Quantitative Equilibrium

### The Equilibrium Constant

For problem one, write the expression for the equilibrium constant for each of the reactions. For problem two, from the data provided, calculate the value of the equilibrium constant for the reactions listed in problem one. Two of the problems require you to find the concentration of one of the chemicals in the equation given the other concentrations and the equilibrium constant.

1)
1. H2 + Cl2 ↔ 2HCl
2. 2SO2 + O2 ↔ 2SO3
3. N2 + 3H2 ↔ 2NH3
4. 2CO + O2 ↔ 2CO2
5. N2 + ½ O2 ↔ N2O
6. HCN ↔ H+ + CN
7. H2SO4 ↔ H+ + HSO4

2)
1. [H2] = [Cl2] = 1.0 × 10–2 M;
[HCl] = 1.0 × 10–4 M
This is read: “The concentration of hydrogen gas equals the concentration of chlorine gas equals 1.0 × 10–2 M; The concentration of HCl is 1.0 × 10–4 M”
2. [H2] = 2.0 × 10–2 M; [Cl2] = 2.5 × 10–2 M;
[HCl] = 1.5 × 10–3 M
3. [SO2] = 1.0 × 10–3 M; [O2] = 2.0 × 10–3 M;
[SO3] = 3.0 × 10–3 M
4. [N2] = 4.4 × 10–2 M; [H2] = 1.2 × 10–1 M;
[NH3] = 3.4 × 10–3 M
5. [N2] = 0.25 M; [H2] = 0.10 M;
[NH3] = 0.010 M
6. [CO] = 0.5 M; [O2] = 0.5 M;
[CO2] = 2.5 M
7. Find [SO3] if [O2] = 2.4 × 10–3 M;
[SO2] = 4.1 × 10–4 M
and Kc = 4.5 × 103
8. Find [CO] if [O2] = 1.3 × 10–3 M;
[CO2] = 2.5 x 10–4 M
and Kc = 3.6 x 10–3

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### Solubility Product

For problem three write the solubility product expression for the equations given. For problem four, use the data provided to find the required quantity.
3)
1. Ag2CO3(s) ↔ 2Ag+(aq) + CO32–(aq)
2. AgCl(s) ↔ Ag+(aq) + Cl(aq)
3. BaSO4(s) ↔ Ba2+(aq) + SO42–(aq)
4. CaSO4(s) ↔ Ca2+(aq) + SO42–(aq)
5. Ca3(PO4)2(s) ↔ 3Ca2+(aq) + 2PO43–(aq)
6. FeS(s) ↔ Fe2+(aq) + S2–(aq)
7. Fe(OH)3(s) ↔ Fe3+(aq) + 3OH(aq)
4)
1. [Ag+] = 2.0 × 10–2 M; [CO32–] = 2.1 × 10–8 M;
Ksp = ?
2. [Ag+] = 1.33 × 10–5 M; [Cl] = 1.33 × 10–5 M;
Ksp = ?
3. [Ba2+] = 1.03 × 10–5 M; [SO42–] = 1.03 × 10–5 M;
Ksp = ?
4. [Ca2+] = 8.43 × 10–3 M; [SO42–] = 8.43 × 10–3 M;
Ksp = ?
5. [Ca2+] = 6.78 × 10–5 M; [PO43–] = 6.64 × 10–21 M;
Ksp = ?
6. [Fe3+] = 9.36 × 10–15 M; [OH] = 6.56 × 10–9 M;
Ksp = ?
Bonus Question: What is the common ion effect? Which solubility product questions above show the common ion effect in action?