Question

What is the net ionic equation of `2H^+ + SO_4^(2-) + Ca^(2+) + 2I^- -> CaSO_4 + 2H^+ + 2I^-`?

Answer 1

Simply cancel out the ions that are COMMON as reactants and products......

Explanation:

`cancel(2H^(+))+SO_4^(2-) + Ca^(2+) + cancel(2I^(-)) rarr CaSO_4(s)darr + cancel(2H^+) + cancel(2I^-)`

to give.......

`Ca^(2+)+SO_4^(2-) rarr CaSO_4(s)darr`

And the questions you've gots to be asking yourself are:

`"(i) Is mass balanced?"`

`"(ii) Is charge balanced?"`

Well are they? If they are not, then you have not made a reasonable representation of chemical reality. `CaSO_4` is reasonably insoluble in aqueous solution, and it precipitates from solution as a white solid.