Maharashtra State BoardSSC (English Medium) Class 8
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Explain by Writing a Word Equation. - Science

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ConceptChemical Changes in Everyday Life

Question

Explain by writing a word equation.

Hard water gets softened on mixing with a solutions of washing soda.

Solution

Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble.
The carbonate ions from sodium carbonate reacts with calcium and magnesium ions in the water to produce insoluble precipitate.
For example: 

Ca2 + (aq) + Na2Co3 → CaCO3(s) + 2Na+(aq)

The water is softened because it no longer contains dissolved calcium ions and magnesium ions.

  Is there an error in this question or solution?

APPEARS IN

 Balbharati Solution for Balbharati Class 8 Science - General Science (2018 to Current)
Chapter 13: Chemical Change and Chemical Bond
Exercise | Q: 2.2 | Page no. 94
Solution Explain by Writing a Word Equation. Concept: Chemical Changes in Everyday Life.
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