H2SO4(aq) + Ba(OH)2(aq) --> BaSO4(s) + 2H22O(l) SO the ions that react are Ba(2+) and SO4(2-) and the others H+ and OH- react to create water. Solution H2SO4(aq) + Ba(OH)2(aq) --> BaSO4(s) + 2H22O(l) SO the ions that react are Ba(2+) and SO4(2-) and the others H+ and OH- react to create water..