Question 603 of 991 in Principles of Chemistry

Formulae for ionic compounds

1 mark · Easy

Write the formula for the ionic compound formed between aluminium ions and chloride ions.

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AlCl3

Also accept: AlCl3

Common mistakes: AlCl2; Al3Cl; Al3Cl2

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Marking points

A1 · 1 mark · Correct formula: AlCl3 (1 mark).

Worked solution

Aluminium forms Al3+ ions and chlorine forms Cl− ions. Three chloride ions are needed to balance one Al3+ ion, so the formula is AlCl3.

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