when comparing the strengths of different oxy asses remember that if they have a different number of oxygen's than the higher than remaining oxygen's the more acidic. So let's say we're comparing nitric acid versus nitrous acid. This one when we subtract the number of oxygen by hydrogen, we have two oxygen's left. This one would have one oxygen left. So since nitric acid has more remaining oxygen, it's more acidic. But let's say if they have the same number of oxygen remaining, then we'd say the more electro negative, the nonmetal, the more acidic. So let's say for instance, we're looking here at per bronek acid versus same number versus per io take acid. They both have the same job, oxygen's remaining three. So we look at electro negativity which remember as we're heading towards the top right corner of the periodic table will increase grooming is higher up than iodine. So grooming is more electro negative and therefore per bronek acid is more more acidic than per ionic acid. Now, of course, with rules, sometimes you run into exceptions. So here we have three different illustrations here for the first one we have oxalic acid which is H two C 204. When we work out the math, we still have two oxygen's remaining and when we do the same thing with ionic acid, we still have two oxygen remaining, which would tell us it should be a strong they both should be strong oxy acids. But there are exceptions to that rule, the electro negativity of their carbon and iodine is pretty low compared to other non metals. This interferes with their acidity acidity and this is the easiest way to think about this exception because of that oxalic acid and ionic acid are weak oxy acids. Now this last one doesn't necessarily represent only this compound, but it represents a class of compounds it belongs to, which is your alfa terek species. Remember a philatelic species can be acidic or basic for the group of Alphatec species that are not strong oxy acids. Even when following the math, they will have a hydrogen and they will have a negative charge hydrogen because it can be acidic negative charge because they have the ability to be basic. So here doesn't matter that we do the math and it fits the criteria to be a strong oxi acid. It just won't be because it's an esoteric. So, remember our three exceptions are oxalic acid, biotic acid and esoteric species. So just keep these rules in mind when you're trying to compare the strength of different types of oxy acids