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05/21/2021 06:09 PM 

H acid endings
Category: Resources

For those who have trouble remembering the endings for hydrogen compounds.
-ide
This one is easy. It follows the rules of the general two-element compounds in that it ends in -ide. So there's no mneumonic necessary.
With only two elements, you add hydro- at the front
HCl = -ide. [Hydrochloride]. 
Now this also becomes an -ic- ending when we're talking about it as an acid. So, hydro- prefix, -ic suffix.
Hydrochloric acid. 

-ate
HClO3 = -ate. [Hydrochlorate]. "3 ate 2."
It has three oxygen atoms.
It has an -ic ending when talking about chloric acid. The mneumonic for remembering which is which is found in -ite below.

-ite
HClO2 = -ite [Hydrochlorite]. "2 died of fright." Fright = -ite
It has two oxygen atoms.
It has an -ous 
When it comes to actually naming the acid, it depends on whether the compound is generally O4 or O3 for -ate.

If its -ate is O3, like CO3, O2 would have an -ite/-ous ending.
If its -ate is O4, like SO4, O3 would have an -ite/-ous

I generally think of O2 for my mneumonic. I know it's -ous because the song  "Just the Two of Us" plays in my head and -ous has us in it. Therefor it's chlorous acid. If it doesn't have O2, I know it's chloric, because that's the only other option there is. If you know the compound falls into the CrOPSS category, just remember that O3 for CrOPSS compounds is the equivalent of O2 for memorization purposes. 

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