C3, Water 0.0 / 5 ? ChemistryWater hardness and solubilityGCSEAQA Created by: emmajane_Created on: 14-05-14 12:50 What makes water hard? The precence of calcium and magnesium ions 1 of 7 What forms scum? When calcium and magnesium ions react with soap 2 of 7 How can you measure the hardness of water? By titrations 3 of 7 When is temporary hard water softened? When heated to boiling point 4 of 7 How can you soften hard water? Remove calcium and magnesium ions 5 of 7 How can you remove calcium and magnesium ions from water? Name 2 ways 1. Add sodium carbonate 2. Use ion exchange columns 6 of 7 What happens when you react sodium carbonate with calcium and magnesium ions? An insoluble precipitate is formed 7 of 7
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