 Phosphoric acid and barium hydroxide so phosphoric acid again We're going to need to maybe go back to a previous slide if you don't remember phosphoric acid H3P04 aqueous with barium hydroxide B a OH2 and we're going to form H2O Liquid plus a salt which is going to be barium Phosphate Okay, some little tricky things here barium is in group 2 so it is a plus 2 the phosphate group We just have to one of these ones. We have to try and remember. It's a 3 minus There's a little clue here in the fact that the formulas H3PO4 But it's one of those things that we need to sort of have a little table next to our work Maybe on our desk that you can refer to until these become a little more set in your mind Now of course this equation is not balanced So I'm going to have to balance it up first of all so I've got three BS I'm going to put three in front of here. I've got two PO4 So I'm going to put two in front of here, then I've got six and six cell I'm going to actually need Six water molecules and so now I should be all right, but let's quickly just have a look at the net ionic equation So if I go here, I've got six H pluses when I pull this apart. I've got two PO4 Three minuses. I've got three BA two pluses and I've got three to six OH minuses Then I've got six H2O's I've got three BA two plus and Unfortunately, I'm going to have to squeeze it down here two PO4 three minus. That's not great but again when I do my elimination on the basis of spectator ions two and two Three and three you see what I get is the same thing that I had before of course now six H plus Six OH minus gives me six H2O liquid And of course I could simplify this down to H plus plus OH minus Gives H2O one of the key things that we need to look at with these Neutralization reactions is that net ionic equation just comes down to the hydrogen ions plus the hydroxide ions producing water Thanks for watching