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 F e 2 + and S O 2 4 ions. In order to form a neutral salt, what must the ratio between the two ions be?

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

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 3 2
  • B F e O
  • C F e O 4 6
  • D F e O 2 3
  • E F e O 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 2
  • B N a 2 C l 2
  • C N a 2 C l
  • D N a C l
  • E N a 3 C l 4

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

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

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