Unit 6: Chemical Nomenclature Naming and Writing Formulas for Acids.

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Presentation transcript:

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