Consider the reaction below:
CaS (aq) + MgSO4 (aq) ↔ CaSO4 (s) + MgS (aq)
If K is 20 and the initial concentrations of CaS, MgSO4 and MgS are 0.5 M, 0.6 M and 0 M respectively, what is the equilibrium concentration of MgSO4?
1. 0.1 M
2. 0.4 M
3. 0.2 M
4. 0 M
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