What is the formula of Calcium Hydroxide?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the formula of Calcium Hydroxide?

Explanation:
Balancing charges in ionic compounds is what this question tests. Calcium forms a Ca2+ ion, while hydroxide is OH−. To make a neutral compound, you need two OH− ions for every Ca2+, giving the simplest whole-number ratio Ca(OH)2. The parentheses indicate there are two hydroxide groups attached to the calcium. The other options don’t reflect the proper charge balance or standard naming: CaOH2 isn’t the conventional way to show the two hydroxide groups with calcium’s +2 charge; Ca2(OH)2 isn’t the typical formula notation for this compound, and Ca(OH)3 would imply three hydroxide ions balancing to a +2 charge, which isn’t correct for calcium.

Balancing charges in ionic compounds is what this question tests. Calcium forms a Ca2+ ion, while hydroxide is OH−. To make a neutral compound, you need two OH− ions for every Ca2+, giving the simplest whole-number ratio Ca(OH)2. The parentheses indicate there are two hydroxide groups attached to the calcium.

The other options don’t reflect the proper charge balance or standard naming: CaOH2 isn’t the conventional way to show the two hydroxide groups with calcium’s +2 charge; Ca2(OH)2 isn’t the typical formula notation for this compound, and Ca(OH)3 would imply three hydroxide ions balancing to a +2 charge, which isn’t correct for calcium.

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