What are the spectator ions in the equation #2Na^+(aq) + SO_4 ^(2-) (aq) + Ba^(2+)(aq) + 2Cl^(-)(aq) → BaSO_4(s) + 2Na^+(aq) + 2Cl^(-) (aq)#?
The spectator ions are the ones that can be cancelled out of the equation:
Which is the
All I have done is subtract the common reagents from each side of the equation. We do the same sort of thing in algebra when we subtract something from BOTH sides of the equation.