A sample of water contained 30 ppm of MgSO4, its hardness is x + 20 ppm. What is 'r'.
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Answer:
Molecular weight of MgSO
4
=120 gms.
120 gms of MgSO
4
has hardness =100 ppm.
30 ppm of MgSO
4
has hardness =
120
100
×30=25 ppm.
Explanation:
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