What happens when Ca is added to water?

[MotoPayton]

I watched a science experiment recently at school where my physics teacher put quite a bit of solid Ca in hot water and let it produce hydrogen gas.

Since I have been learning about acids in bases in chem, I was trying to analyze what happened here.

Ca dissociates from itself to produce Ca2+ cations that. First question( where did the electrons go?)

Next I assumed that the Ca2+ ions started absorbing the hydroxide ions from solution to form Ca(OH)2 (s) (which has a low Ksp.) During this reaction the hydronium is produced(why is the H2 formed instead of just (H30+)

Then eventually equilibrium is reached between the solid calcium hydroxide, the solid Ca, and the ions in solution.

And I believe the solution to be acidic unless all the H30+ turned into H2 gas.

Not sure on all of this and If anyone could provide a detailed analysis I would be stoked to read it.

Thanks

 

[Borek]

Ca doesn't dissociate, it reduces water, producing hydrogen, solution becomes alkalic, you are right about Ca²⁺ being produced.

IMHO that's enough information to write reaction equation (well, IMHO it is twice enough).