40 gm Ca(OH)2 is required for softening 500 ltr. hard water containing Mg(HCO3)2 calculate quantity of Mg(HCO3) in 1 litre of hard water.
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We can calculate the hardness of given water sample as:
(i) Ca(HCO3)2CaCO3≡CaCO3
162ppm≡100ppm
∴81ppm≡50ppm
(ii) Mg(HCO3)2≡CaCO3
146 ppm ≡ 100 ppm
∴73ppm≡50ppm
(iii) CaSO4≡CaCO3
136ppm≡100ppm
∴68ppm≡50ppm
(iv) MgSO4≡CaCO3
120ppm≡100ppm
∴60ppm≡50ppm
Total degree of hardness of water =50×4=200ppm
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