When calcium metal reacts with sulphuric acid, the reaction stops after a short while. Why?
1
The reaction of calcium with sulphuric acid is not feasible at room temperature
2
Formed calcium sulphate is insoluble in water and covers the calcium metal, preventing it from reacting any further
3
Formed calcium sulphate requires two molecules of water to crystallize as gypsum
4
Formed calcium sulphate is unstable