Worksheet: Formulas of Ionic Compounds

In this worksheet, we will practice deducing the chemical formulas of salts from the charges of their constituent cations and anions.

Q1:

Iron(II) sulfate is composed of Fe2+ and SO24 ions. In order to form a neutral salt, what must the ratio between the two ions be?

  • A F e 2 + : SO24 = 1 : 2
  • B F e 2 + : SO24 = 4 : 1
  • C F e 2 + : SO24 = 1 : 1
  • D F e 2 + : SO24 = 1 : 4
  • E F e 2 + : SO24 = 2 : 1

Q2:

Iron(III) ions have a charge of 3+ and oxide ions have a charge of 2. What is the formula of iron(III) oxide?

  • A F e O
  • B F e O 4 6
  • C F e O 3 2
  • D F e O 3
  • E F e O 2 3

Q3:

Sodium ions have a charge of 1+ and chloride ions have a charge of 1. What is the formula of the compound formed from sodium ions and chloride ions?

  • A N a C l
  • B N a C l 2
  • C N a C l 3 4
  • D N a C l 2
  • E N a C l 2 2

Q4:

Magnesium ions have a charge of 2+ and chloride ions have a charge of 1. What is the formula of magnesium chloride?

  • A M g C l
  • B M g C l 2 4
  • C M g C l 2
  • D M g C l 4 2
  • E M g C l 2

Q5:

Aluminum ions have a charge of 3+ and chloride ions have a charge of 1. What is the formula of aluminum chloride?

  • A A l C l 2 6
  • B A l C l 3
  • C A l C l 3
  • D A l C l 2 3
  • E A l C l

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