Question

column A. column B

1. surface water. a. 4* C
2. Maximam density. b. obtained
of water. by rain
3.Dissolved salts of. c. water
calcium and magnesium find its
4. jaundice. level
5.physical property of. d. hardness
water. of water
e. pollution
of water​

Answer 1

Answer:

Sodium carbonate 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 react with the calcium and magnesium ions in the water to produce insoluble precipitates.

Ca+2(aq.)+Na2CO3(aq.)⟶CaCO3(s)+2Na+(aq.)

Mg+2(aq.)+Na2CO3(aq.)⟶MgCO3(s)+2Na+(aq.)

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Explanation:

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