Nomenclature - Nomenclature of'ate Oxoanions'Oxo anions are...

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Nomenclature of 'ate' Oxoanions 'Oxo' anions are negatively charged ions containing oxygen plus another element such as nitrogen or sulfur. For example: NO 3 - = Nitr ate SO 4 2- = Sulf ate You can recognize an oxoanion because it always has the suffix 'ate' or 'ite' . Think of an oxoanion as a group . Never break it up further into elements. Note that in the formulas above oxygen is written last. Note also that the number of oxygens and the charge of the ion varies depending upon the element it is bonded to. There is no way to use the periodic table to determine how many oxygens are attached. This is a case where you need to memorize the formulas and charges. Learn (memorize) the names and formulas for the ' ate ' anions. Once you know these, it is easy to constuct the ' ite ' anions. These are the 'ate' anions you should learn : Nitrate ... NO 3 - ... 1- ions Acetate CH 3 COO - Chlorate ClO 3 - Perchlorat e* ClO 4 - Permanga nate MnO 4 - Carbonate CO 3 2- 2- ions Sulfate SO 4 2- Chromate CrO 4 2- Dichromat e Cr 2 O 7 2- Phosphat e PO 4 3- 3- ions *perchlorate = one more oxygen than chlorate Remember, whenever the name of a compound ends in ' ate ' it contains an oxoanion. Acid and Anion Nomenclature If you know the names of the following five acids and their anions, and a few simple rules, you will be able to name a large number of inorganic acids and anions. Acid Model Acid Formula Acid Name Anion Model Anion Formula Anion Name
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HClO 3 chloric acid ClO 3 - chlorate ion HNO 3 nitric acid NO 3 - nitrate ion H 2 SO 4 sulfuric acid SO 4 2- sulfate ion H 2 CO 3 carbonic acid CO 3 2- carbonate ion H 3 PO 4 phosphoric acid PO 4 3- phosphate ion Nomenclature of 'ite' Oxoanions 'Oxo' anions are negatively charged ions containing oxygen plus another element . You can recognize an oxoanion because it always has the suffix 'ate' or 'ite' . Once you know the ' ate ' anions, it is easy to constuct the ' ite ' anions. For example: ClO 3 - = Chlor ate ClO 2 - = Chlor ite ClO - = Hypo chlor ite
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Note that chlor ite has one fewer oxygen than chlor ate and they have the same charge. Hypo chlor ite has two fewer oxygens with the same charge. To form the ' ite ' anion, remove one oxygen from the ' ate ' anion. To form the ' hypo' __ 'ite ' ion, remove two oxygens from the ' ate ' anion. Not all 'ate' anions have 'ite' counterparts. These are the
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This note was uploaded on 04/07/2010 for the course CHEMISTRY chem 130 taught by Professor Mr during the Spring '10 term at University of Michigan.

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Nomenclature - Nomenclature of'ate Oxoanions'Oxo anions are...

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