3. Chemical Reactions
Naming Ionic Hydrates
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In this example question, we're told to name the following ionic hydrate. Alright. So let's do the easy part first. We have 5 water molecules here. So 5 would mean that we're using the, numerical prefix of penta and the water would be called hydrate. So this is pentahydrate. Now if we take a look at the ionic compound portion, we have lead with oxygen. With lead, we have an issue though. Lead can have a charge of either 2+ or 4+. Remember, lead is not a transition metal, but it and tin have this issue where they can be 2+4+. If you don't remember that, again, go back and take a look at my periodic table videos that deal with charges. Now here, oxygen oxygen is in group 6 a. And remember if you're group 6 a, your charge is 2 minus or minus 2. So let's think about this. Oxygen is minus 2, there are 2 oxygens within the formula. So collectively, the oxygens together are -4. For Pb02 to be neutral, this -four has to be counterbalanced or canceled out by what? By a+4. So the plus 4 of the lead cancels out the -four from the 2 oxygens, thereby giving us a neutral ionic compound. So that would mean that we're dealing with, for our ionic compound, lead 4, remember, it uses Roman numerals because it has multiple charges, lead 4, oxygen's base name is ox, and then we put I at the end. So lead 4 oxide pentahydrate. So this one was tricky, but this would be the name of our ionic hydrate.
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