Ionic compounds continued Metals with Multiple Charges Metals

Ionic compounds continued Metals with Multiple Charges

Metals with Multiple Charges • Some transition metals have multiple charges. • For example iron has a stable cation when it has a charge of Fe 2+ and Fe 3+ • Because of this there are two different compounds that can be formed with anions – Fe. Cl 2 is light green when solid – Fe. Cl 3 is yellowish brown when solid

Naming metals with multiple charges • When there are two different compounds that can be formed with anions we must indicate using roman numerals which anion we are using: – Fe. Cl 2 using Fe 2+ – Fe. Cl 3 using Fe 3+ - iron (II) chloride - iron (III) chloride

Metals with Multiple Charges Metal Chemical symbol of elements Chemical symbol of Names of ions Copper Cu Cu + Cu 2+ Copper(I) Copper (II) Iron Fe Fe 2+ Fe 3+ Iron (II) Iron (III) Lead Pb Pb 2+ Pb 4+ Lead (II) Lead (IV) Manganese Mn Mn 2+ Mn 4+ Manganese (II) Manganese (IV) tin Sn Sn 2+ Sn 4+ Tin (II) Tin (IV)

Considering multiple ionic charges • Write the chemical name of Cu. Br 2 • Problem, what cation of Cu is being used? Step 1: Use x to represent the unknown value, knowing that when we add the charge of bromine and copper it must = a net of 0 • Cu. Br 2 • X + 2(-1) = 0 • X -2 =0 • X=2 Therefore the ionic charge of copper is +2

Considering multiple ionic charges • Step 2: Write the name of the compound, using roman numerals to represent the charge of copper • Cu. Br 2 copper(II) bromide

Considering multiple ionic charges Example 2: What is the chemical name of Pb. O 2?