What would the two half reactions look like for
Sr(s) reacting with excess 1M H4NHCO3. I really do not understand. It says that a precipitate and a flammable gas are among the products.
Sr(s) + NH4CO3(aq) ==> ppt + flammable gas.
Wouldn't you expect the ppt to be SrCO3?
And Sr + the water in the 1 M NH4CO3 solution must be H2 gas.
Can you continue?