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  • Which of the following ions is responsible for the permanent hardness of water?Option: 1 Calcium ions  <

Which of the following ions is responsible for the permanent hardness of water?

Option: 1

Calcium ions

 


Option: 2

Magnesium ions


Option: 3

Sodium ions

 


Option: 4

Potassium ions


Answers (1)

best_answer

 The permanent hardness of water is caused by the presence of calcium and magnesium ions in the water. These ions form insoluble compounds with soap, which results in the formation of scum and reduces the cleaning ability of the soap.

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