in this video we're going to focus on naming acids so let's say if you want to name h2so4 how would you do it well first you need to know some rules if it contains a polyatomic ion with the word a all you need to add is ick if it has a polyatomic ion with the word i replace it with the suffix s and add the word acid at the end by the way now if it's a monoatomic ion with the end in i'd need to add the prefix hydro plus the suffix ic so let's look at h2so4 so h2so4 contains the polyatomic ion sulfate and to name acids you do need to know your polyatomic ions so we need to replace eight with egg so we're going to add the word sulfur and then actually so it's going to be called sulfuric acid now what if we want to name h2so3 h2so3 contains the polyatomic ion sulfite and sulfite has the end in i which we need to replace with is so let's start with the element sulfur and add the suffix is so it's going to be sulfurous acid now what about this one h2s so h2s contains the monoatomic ion sulfide which is s2 minus now because it has the end in ide we need to add the prefix hydro and then we're going to add the word sulfur that's the element and then the suffix ic so it's hydrosulfuric acid let's try some more examples so what about hclo4 what's the name of this acid so what is the name of the polyatomic ion clo4 this is called perchlorate now since it ends with the suffix 8 we need to replace it with ick so we're going to write the same name but instead of saying perchlorate it's going to be perchloric acid now what about hc go ahead and name this acid so the oxyacid hclo has the polyatomic ion hypochlorite so to name the acid all we need to do is replace the suffix i with is so it's going to be called hypo acid try this one name the binary acid hcl so hcl contains the monoatomic ion known as chloride so to name the acid we need to add the prefix hydro and then let's write this part of the name instead of saying chlorine we're going to say we're going to replace the i with the ick so hydrochloric acid now let's try some other examples how would you name h no3 and h no2 so hno3 contains the polyatomic ion nitrate so we need to replace the suffix eight with ick so we're still going to write the nitr part and then let's add egg to it so it's going to be nitric acid a hnl2 has the polyatomic ion nitrite so let's rewrite this part and then let's replace it with is so it's nitrous acid now how would you name the acid hi h i contains the monoatomic ion iodide so we need to add the prefix hydro the word io or iod and then replace the ige part with ick so it's hydroiodic acid try this one hc2h3o2 what is the name of that particular acid so let's find the polyatomic ion first c2h3o2 minus this is called acetate so we're going to keep the part without the eight and we're going to replace the 8 with x so it's going to be acidic acid how would you name or rather how would you write the formula for phosphoric acid so let's work backwards so what's the first thing we should do in this particular example the first thing that you need to look for is the polyatomic ion that is associated with phosphoric acid we don't have the word hydro so we know it's not a monoatomic ion so it has to be a polyatomic ion and because we could see the egg part of the acid we know is associated with eight so it's going to be phosphate the formula for phosphate is po4 three minus now take a look at the negative charge because the charge is negative three we need to add three hydrogens to it to neutralize that negative three charge each hydrogen ion has a plus one charge so it's going to be h3po4 simply add three hydrogens to it put it in the front and that's how you can name or rather write the formula for phosphoric acid let's try another example try this one phosphorus acid so what is the formula for phosphorus acid what polyatomic ion corresponds to it so we could see the suffix is so we know it's associated with phosphite and the formula for phosphite is po3 negative three so we have to add three hydrogens to it so the formula is going to be h3po3 what is the formula for carbonic acid feel free to take a minute and try that example so once again we don't have the prefix hydro so we know it's a polyatomic ion and because we see the suffix ick it's associated with eight so what is the formula for carbonate the formula for carbonate is co3 two minus so we have a negative two charge we need to add two hydrogens to it so it's going to be h2co3 this is the formula for carbonic acid now what about this example hydrobromic acid what is the formula so notice that we have the prefix hydro that's a good indication that it's a monoatomic ion most likely there are some exceptions so the monoatomic ion for br is simply bromide so whenever you see ide it's associated with the prefix hydro and ic that part is pretty much a guarantee that that's usually the case the formula for bromide is br with a negative one charge now since we have a negative one charge we need to add only one hydrogen to neutralize it so therefore the formula for the acid is simply hbr now consider this example it's a little unusual but we can still get the answer hydro cyanic acid so we have the prefix hydro and the suffix ic so it indicates that it's probably a monatomic ion however we also know that it has to have the end in eight so this has to be associated with cyanide now cyanide is not a monoatomic ion it's actually polyatomic it has two atoms but nevertheless it does have the suffix eyed which is associated with hydroplus ic so that rule is pretty much intact since it has a negative one charge we're going to add only one hydrogen to it so it's going to be hcn that's the formula for hydrocyanic acid