Ionic nomenclature
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Ionic Nomenclature. Naming Ionic Compounds. Ionic Compounds Review. Ionic compounds are made of positive and negative ions. Also known as “salts”. Polyatomic ions are groups of atoms that behave as a single ion: Examples: CO 3 -2 CN -1 SO 4 -2. Naming Ionic Compounds.

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Ionic Nomenclature

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Ionic nomenclature

Ionic Nomenclature

Naming Ionic Compounds


Ionic compounds review

Ionic Compounds Review

  • Ionic compounds are made of positive and negative ions.

    • Also known as “salts”.

  • Polyatomic ions are groups of atoms that behave as a single ion:

    • Examples:

      • CO3-2

      • CN-1

      • SO4-2


Naming ionic compounds

Naming Ionic Compounds

  • Two types of ionic compounds:

    • Binary, contains 2 elements

      • NaCl, MgBr2, Fe2O3

    • Ternary, contains 3 elements

      • Two of the elements are in a polyatomic ion

      • NaNO3, NH4Cl, Cr2(SO4)3


Naming binary ionic compounds

Naming Binary Ionic Compounds

  • Some metal ions have only one possible charge:

    • Group 1A metal ions all have +1 charge.

    • Group 2A metal ions all have +2 charge.

    • Ag+1, Zn+2, Cd+2, Al+3, Ga+3

  • For fixed charge cations, name as element.

    • Na+1 = sodium ion

    • Ca+2 = calcium ion

    • Ag+1 = silver ion

    • Ga+3 = gallium ion

  • Name anion as stem of element’s name followed by suffix –ide.

    • Cl-1 = chloride ion

    • S-2 = sulfide ion

    • N-3 = nitride ion


Fixed charge metal ions

Fixed Charge Metal Ions

Li+1

Be+2

Al+3

Na+1

Mg+2

K+1

Ca+2

Ga+3

Zn+2

Rb+1

Sr+2

Ag+1

Cd+2

Cs+1

Ba+2

Fr+1

Ra+2


Naming binary ionic compounds1

Naming Binary Ionic Compounds

  • NaCl

  • KBr

  • MgF2

  • CaO

  • AgI

  • Al2S3

  • Zn3P2

sodium chloride

potassium bromide

magnesium fluoride

calcium oxide

silver iodide

aluminum sulfide

zinc phosphide


Naming binary ionic compounds2

Naming Binary Ionic Compounds

  • Most metals can form multiple cations.

    • Iron can form Fe+2 ions or Fe+3 ions.

    • Copper can form Cu+1 ions or Cu+2 ions.

  • For variable charge cations, name as element w/ Roman numeral in ( ) to indicate charge.

    • Fe+2 = iron(II) ion

    • Fe+3 = iron(III) ion

    • Cu+1 = copper(I) ion

    • Cu+2 = copper(II) ion

    • Pb+2 = lead(II) ion

    • Pb+4 = lead(IV) ion


Variable charge metal ions

Variable Charge Metal Ions


Naming binary ionic compounds3

Naming Binary Ionic Compounds

  • The compound must be electrically neutral.

  • Use the charge of the anion to figure out the charge of the metal.

    • Example: Fe2O3

      • (2 x Fe) + (3 x -2) = neutral

      • (2 x Fe) – 6 = neutral

      • (2 x Fe) = +6

      • Fe = +3

      • iron(III) oxide

    • Example: FeO

      • Fe + -2 = neutral

      • Fe = +2

      • iron(II) oxide


Naming binary ionic compounds4

Naming Binary Ionic Compounds

  • FeCl2

  • Fe2Se3

  • CuBr

  • CuS

  • CrO

  • CrI3

  • PbF2

  • PbS2

iron(II) chloride

iron(III) selenide

copper(I) bromide

copper(II) sulfide

chromium(II) oxide

chromium(III) iodide

lead(II) fluoride

lead(IV) sulfide


Naming ternary ionic compounds

Naming Ternary Ionic Compounds

  • Name metal as you would for a binary, with charge as a Roman numeral if necessary.

  • Name polyatomic anions as themselves.Know these:

    • CO3-2 = carbonate

    • NO3-1 = nitrate

    • PO4-3 = phosphate

    • SO4-2 = sulfate

    • OH-1 = hydroxide

  • ClO-1 = hypochlorite

  • ClO3-1 = chlorate

  • C2H3O2-1 = acetate

  • CH3COO-1 = acetate

  • CN-1 = cyanide


Naming ternary ionic compounds1

Naming Ternary Ionic Compounds

  • Only one polyatomic cation:

    • NH4+1 = ammonium

  • Name it, then name the anion properly.


Naming ternary ionic compounds2

Naming Ternary Ionic Compounds

  • LiNO3

  • Mg(OH)2

  • Fe2(SO4)3

  • Zn(C2H3O2)2

  • AlPO4

  • NH4Cl

  • Cr(CN)2

lithium nitrate

magnesium hydroxide

iron(III) sulfate

zinc acetate

aluminum phosphate

ammonium chloride

chromium(II) cyanide


Writing formulas from names

Writing Formulas From Names

  • To write an ionic formula from a name, write the ions with their proper charges, then criss-cross.

    • Don’t forget that polyatomic ions need parentheses if there’s more than one of them.

  • Write the formula for iron(III) hydroxide

    • iron(III) = Fe+3

    • hydroxide = OH-1

    • iron(III) hydroxide  Fe+3 + OH-1 Fe(OH)3

  • Write the formula for potassium sulfate

    • potassium = K+1

    • sulfate = SO4-2

    • potassium sulfate  K+1 + SO4-2  K2SO4


Writing formulas from names1

Writing Formulas From Names

  • calcium carbonate 

  • sodium oxide 

  • aluminum cyanide 

  • potassium acetate 

  • copper(II) hydroxide 

  • gold(III) sulfide 

Ca+2 + CO3-2

Na+ + O-2

Al+3 + CN-1

K+1 + C2H3O2-1

Cu+2 + OH-1

Au+3 + S-2

CaCO3

Na2O

Al(CN)3

KC2H3O2

Cu(OH)2

Au2S3


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