Which reaction is the correct ionic equation for the softening process of permanent hardness of water using washing soda?
Understand the Problem
The question is asking which ionic reaction is correct for removing permanent hardness of water using washing soda. This involves understanding the chemistry of the reactions related to hard water treatment.
Answer
B. Ca2+(aq) + CO3 2-(aq) → CaCO3(s).
The correct ionic equation is: B. Ca2+(aq) + CO3 2-(aq) → CaCO3(s).
Answer for screen readers
The correct ionic equation is: B. Ca2+(aq) + CO3 2-(aq) → CaCO3(s).
More Information
Washing soda (sodium carbonate) is used in water softening to precipitate calcium ions as calcium carbonate, which is insoluble.
Tips
A common mistake is confusing chloride and sulfate reactions. Focus on carbonate reactions when using washing soda.
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