Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: saman_Z on December 29, 2008, 12:38:22 PM
Title: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: saman_Z on December 29, 2008, 12:38:22 PM
for instance oxide is (O)2- while peroxide is (O-O)2- Similarly manganate is (MnO4)2- and permanganate is(MnO4)- . Why are they named so?? ::)
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: Dungsbars on December 29, 2008, 02:39:44 PM
Per means higher oxidation state. MnO42- has Mn at +VI, while MnO4- has Mn at +VII. O2- has O at -II, while O22- has O at -I.
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: ARGOS++ on December 29, 2008, 03:11:51 PM
Dear Saman_Z;
You can find a lot about this Nomenclature, if you search on the Internet for:
“prefix per peroxide permanganate”
Good Luck! ARGOS++
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: macman104 on December 29, 2008, 03:53:07 PM
Using ARGOS's search, it appears that originally it was used for acids that were formed from Hydrogen Peroxide or release it upon treatment with sulfuric acid. You read the first few pages of this book:
But I suppose what you are really asking is why do we use the prefix "per" and not..."foo" or whatever you want. That may or may not be online, or it may be one of those relics that no one knows why it's called per, not sure.
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: ARGOS++ on December 29, 2008, 04:09:11 PM
Dear macman104;
For “per-” see on: http://www.affixes.org/p/per-.html or : http://www.merriam-webster.com/dictionary/per-
Good Luck! ARGOS++
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: macman104 on December 29, 2008, 06:09:57 PM
Thanks, that's what I was looking for.
Actually, that first link looks exactly like what you want.
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: saman_Z on December 29, 2008, 11:29:57 PM
thankyou so much, ARGOS++ and MACMAN 104!!!!! :)..
Title: Re: what is the logic behind adding the prefix 'per' to the names of ions??
Post by: ARGOS++ on December 30, 2008, 03:23:29 AM