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What does multivalent mean?. Some transition metals are multivalent This means they have more than one ion form Look at the periodic table and locate some multivalent transition metals The most common ion is listed first What is the most common ion for Cu? , Au?. Page 172.

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What does multivalent mean
What does multivalent mean?

  • Some transition metals are multivalent

  • This means they have more than one ion form

  • Look at the periodic table and locate some multivalent transition metals

  • The most common ion is listed first

  • What is the most common ion for Cu? , Au?

Page 172


What are multivalent ions?

For Example: Copper has 2 ion forms

Can be a 1+ or 2+ ion

Copper I Chloride

Copper II Chloride


Writing names for multivalent ions
Writing names for multivalent ions

  • We need to distinguish between the two or three different ion forms

  • Use roman numerals from I – VII which corresponds to 1+ - 7+ ion charges

  • For example:

    • Nickel can have two ion forms, Ni2+ and Ni3+

    • These are named nickel (II) and Nickel (III)

Metal Ion charge Roman Numeral

1+ I

2+ II

3+ III

4+ IV

5+ V

6+ VI

7+ VII


Writing formulas for compounds containing a multivalent metal
Writing formulas for compounds containing a multivalent metal

  • There will only be 1 multivalent metal in a compound

  • It is the metal so it is first in the name (same as ionic compounds)

  • The roman numeral will indicate which ion form is in the compound


Steps for writing formulas for multivalent compounds
Steps for writing formulas for multivalent compounds metal

  • Step 1: Identify each ion and its charge

  • Step 2: Determine the total charges needed to balance positive and negative

  • Step 3: Note the ratio of positive ions to negative ions

  • Step 4: Use subscripts to write the formula, 1’s are not shown in subscript


Try the formula for titanium iv fluoride
Try the formula for metaltitanium (IV) fluoride

Ti4+ and F1-

ions

Total charge to balance

+4 = -1-1-1-1

ratio

1 : 4

formula

TiF4

189-191


Lowest common multiple a useful trick
Lowest Common Multiple-A useful Trick metal

Manganese (III) Sulfide

Lowest common multiple for 3 and 2 is 6

Mn3+ and S2-

ions

Total charge to balance

+3+3 = -2-2-2

ratio

2 : 3

formula

Mn2S3


Writing formulas for compounds that contain a multivalent metal
Writing formulas for compounds that contain a metalmultivalent metal

Key Points:

  • The metal is always first

  • The metal is always the positive ion

  • The metal could be a multivalent metal

  • Go to the periodic table and check


Steps for writing formulas for compounds that contain a multivalent metal
Steps for Writing formulas for compounds that contain a metalmultivalent metal

  • Step 1: Identify a multivalent metal

  • Step 2: identify its different ion forms

  • Step 3: determine the ratio of ions in the formula

  • Step 4: what is the charge on the negative ion?

  • Step 5: Balance the positive and negative charges

  • Step 6: Write the name using roman numerals in brackets, following the positive ion to indicate which ion was used


Example fei 2
Example: FeI metal2

  • Is there a multivalent metal?

    • Yes, Fe, Iron

  • What are its different ion forms?

    • 3+ and 2+

  • What is the ratio of ions

    • 1 Fe : 2 I

  • What is the charge on the negative ion

    • I, Iodine, ion charge is 1-

    • but there are 2 so the total negative charge is 2-

  • Balance the positive and negative charges

    • Iron must have a 2+ charge to balance the two 1- charges from Iodine

  • Write the name using a roman numeral to say which ion form of Iron is present

    • The negative ion must drop its ending and add –ide (same as ionic compounds)

    • Iron (II) Iodide


  • Try another example pbf 4
    Try another example: PbF metal4

    • Pb

    • 2+ and 4+

    • Pb 1: 4 F

    • F’s ion charge 1-

    • Balance the charges

      • 4+ charges to balance the 4 1- charges of F

  • Therefore Pb must be the 4+ ion

  • Lead (IV) Fluoride



  • Homework metalto help you practice writing formulas and naming compounds that contain a multivalent metal

    • In workbook p. 68 1-3

    Questions to practice writing formulas for

    ionic compounds

    Text book p. 188 1. a, c, e

    2. b, d, f, h, j, l, n