CH-1067
Reactions of acids
Chemistry · Secondary 4 · Medium · Reactions of acids
Which statement explains why hard water forms scum with soap?
- Calcium ions in hard water form insoluble salts with soap anions.
- Soap neutralises the acids in hard water to form scum.
- Hard water has a lower pH so soap molecules decompose.
- Magnesium ions catalyse the breakdown of soap into scum.
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