Calcium Hydroxide

Key Stage 3

Meaning

Calcium Hydroxide is a solid (at room temperature) chemical compound with the formula Ca(OH)₂.

About Calcium Hydroxide

Calcium Hydroxide is a base.

When Calcium Hydroxide is dissolved in water it is an alkali.

Calcium Hydroxide reacts with acids to produce a Calcium salt:

Hydrochloric Acid + Calcium Hydroxide → Calcium Chloride + Water

Sulphuric Acid + Calcium Hydroxide → Calcium Sulphate + Water

Nitric Acid + Calcium Hydroxide → Calcium Nitrate + Water

Key Stage 4

Meaning

Calcium Hydroxide is a solid (STP) chemical compound with the formula Ca(OH)₂.

About Calcium Hydroxide

Calcium Hydroxide is a base.

Aqueous Calcium Hydroxide is an alkali.

Calcium Hydroxide is held together by ionic bonds.

Calcium Hydroxide has a giant ionic structure.

Calcium Hydroxide reacts with acids to produce a Calcium salt:

Hydrochloric Acid + Calcium Hydroxide → Calcium Chloride + Water

2HCl + Ca(OH)₂ → CaCl₂ + H₂O

Sulphuric Acid + Calcium Hydroxide → Calcium Sulphate + Water

H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O

Nitric Acid + Calcium Hydroxide → Calcium Nitrate + Water

2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + H₂O

References

AQA

Calcium hydroxide, page 185, GCSE Chemistry; Third Edition, Oxford University Press, AQA