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Question

Following chemical species were reported for water sample from a well
SpeciesConcentration (milliequivalent/L)Chloride (Cl) 15 Sulphate (SO24) 15 Carbonate (CO23)05 Bicarbonate (HCO3)13 Calcium (Ca2+)12 Magnesium (Mg2+) 18 pH8.5Alkalinity present in the water in mg/L as CaCO3

A
5000
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B
250
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C
1750
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D
1500
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Solution

The correct option is C 1750
Alkalinity is due to (CO3,HCO3OH) [major source]
Alkalinity = Milliequivalent of CO2+3+ Milliquivalent of HCO3
=05+30
=35 milliequivalent/L
=(35×eq.wt.ofCaCO3/L)mg/L
=35×50mg/L
=1750mg/LasCaCO3

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