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+1 vote
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in Chemistry by (55.1k points)

The hardness of a water sample containing 10 –3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______. 

(molar mass of MgSO4 is 120.37 g/mol)

2 Answers

+4 votes
by (58.5k points)
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Best answer

MgSO410-3mol/lit = 10-3mol/lit of CaCO3

Hardness is ppm = 10-3 x 100g x 1000(mg/g)

= 100mg/lit = (100 x 10-3)/1000

= 100ppm

+1 vote
by (52.8k points)

1 Litre has 10–3 moles MgSO4 

So , 1000 litre has 1 mole MgSO4 

= 1 mole CaCO3 = 100 ppm

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