If a sample of water contains 50mg of MgCl2 per litre, calculate the hardness in
terms of CaCO3 equivalents.
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The hardness of water in terms of CaCO₃ equivalents is 52.63 mg/l
Explanation:
Given:
A sample of water contains 50 mg of MgCl₂ per litre
To calculate:
The hardness of water in terms of CaCO₃ equivalents
Solution:
We know that the hardness is due to multivalent ions of Mg and Ca primarily
The balanced equation is:
According to the above
1 mole of MgCl₂ gives 1 moles of CaCO₃
or, 95 gram of MgCl₂ gives 100 grams of CaCO₃
or, 1 gram of MgCl₂ gives 100/95 grams of CaCO₃
or, 50 mg of MgCl₂ gives (100/95) × 50 mg of CaCO₃ = 52.63 mg of CaCO₃
Therefore, the hardness of water = 52.63 mg/l as CaCO₃
Hope this answer is helpful.
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