21 Describe, with reasons, the types of hardness in water samples A, B and C. Explain how washing soda (sodium carbonate) can soften hard water. The quality of written communication will be assessed in your answer to this question. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..................................................................................................................................................... [6] [Total: 6]
Š OCR 2014
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