What is an Oxoacid? An oxoacid is a polyatomic ion plus hydrogen. Polyatomic ions are charged particles that have two or more atoms held together by covalent bonds. + POLYATOMIC ION The oxoacids that we use in Chemistry 11 Advanced found on the nomenclature encyclopaedia deal mostly with Nitrogen, Sulfur, Phosphorous, Chlorine, Bromine and Iodine. Each of these oxyacids contain at least one hydrogen and one oxygen. This is what makes them oxoacids. The best way to remember these elements is to remember that Nova Scotians Play Cards Better Intoxicated…Nitrogen Sulfur Phosphorus Chlorine Bromine Iodine. N-Nova S-Scotians P-Play Hypo… …ous Cl-Cards Br-Better IIntoxicated HClO or HOCl Hypochlorous acid HBrO or HOBr Hypobromous acid HIO or HOI Hypoiodous acid HClO2 or HO2Cl Chlorous acid HBrO2 Bromous acid HIO2 Iodous acid HBrO3 Bromic acid HIO3 Iodic acid HBrO4 Perbromic acid HIO4 Periodic acid …ous (1 hydrogen) HNO2 Nitrous acid (2 Hydrogen) H2SO3 Sulfurous acid (3 Hydrogen) H3PO3 Phosphorous acid …ic HNO3 Nitric acid H2SO4 Sulfuric acid H3PO4 HClO3 Phosphoric acid Chloric acid Per… …ic HClO4 Perchloric acid Look for patterns in this table that will help you remember all the oxoacids. For example, look at how the number of hydrogens increase by one in each column for nitrogen, sulfur and phosphorous. When these oxoacids have a hydrogen in front of them they have no charge. However, when you take away the Hydrogen in front of the oxyacid, they become ionic and have a negative charge. For example, HNO2 has no charge because it is an oxyacid, but when you take away the hydrogen it becomes NO2- with a charge of negative one. The number of hydrogens in front of the oxyacid determines the charge of the oxyacid. For example, phosphoric acid,H3PO4, has three hydrogens in front of it. So if you were to take away the three hydrogens it would leave PO4-3 with a charge of negative three. This rule applies to all of the oxyacids. H2CO3 carbonic acid H2CrO4 chromic acid H3BO3 boric acid HCH3CO2 } acetic CH3COOH} acid Along with the table these are a few other important acids you need to know. All the same rules apply to these oxyacids as well. When an oxoacid losses its hydrogen and becomes ionic, its name also changes. If it’s original ending was ‘ous’ then the new ending will be ‘ite’ and if the original ending was ‘ic’ then the new ending is ‘ate’. The ACOUSITEICATE disease is a trick that can help you remember which ending goes with each other if you break it down like this: AC OUS ITE IC ATE -lets you know that you are dealing with the acids -this is the original ending -this is the new ending replacing the ‘ous’ -this is the original ending -this is the new ending replacing the ‘ate’ OUSITE ICATE Nitrogen Sulfur Phosphorous Chlorine Bromine Iodine ClO- or OClHypochlorite BrO- or OBrHypobromite IO- or OIHypoiodite Hypo… …ite …ite NO2Nitrite SO3-2 Sulfite PO3-3 Phosphite ClO2- or O2ClChlorite BrO2Bromite IO2Iodite …ate NO3Nitrate SO4-2 Sulfate PO4-3 Phosphate ClO3 Chlorate BrO3Bromate IO3Iodate ClO4Perchlorate BrO4Perbromate IO4Periodate Per… …ate The other important acids: CO3-2 - Carbonate Cr04-2 - Chromate BO3-3 - Borate We hope this slide has helped you better your understanding of the oxoacids. Once you get the hang of it, it’s a very easy section. *Remember the easiest way to remember the oxoacids is to find your own little patterns and tricks!!! If you have to make a song, do it!!