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Unit 6: Chemical Nomenclature Naming and Writing Formulas for Acids
After today you will be able to… Identify polyatomic and monatomic ions and name them properly Write the chemical names and formulas of acids
Naming Acids Acids are ionic compounds that contain H +1 as their cation. Acids are named based on their anion.
If the anion ends in… “-ide” hydro ___ ic acid Example: H 2 S Hydrosulfuric acid Sulfide (S -2 ) is the anion! The root name of the anion goes here (remove-ide)
If the anion ends in… “-ate” ___ ic acid Example: H 2 SO 4 Sulfuric acid Sulfate (SO 4 -2 ) is the anion!
If the anion ends in… “-ite” ___ ous acid Example: H 2 SO 3 Sulfurous acid Sulfite (SO 3 -2 ) is the anion!
Mnemonic devices to help you remember: “ate something icky” “gingivite ous”
Formula Writing Use the reverse to determine the anion and balance out the charges for a neutral compound.
Examples Hydrophosphoric acid H +1 P -3 H +1 All acids contain a H +1 as the cation! Ask yourself, “What was the original ending?” H3PH3P Original ending “-ide”: phosphide
Examples Chromic acid H +1 (CrO 4 ) -2 H +1 Original ending “-ate”: chromate H 2 CrO 4
Examples Chlorous acid H +1 (ClO 2 ) -1 Original ending “-ite”: chlorite HClO 2
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