Alkalinity of water, in equivalent/litre (eq/litre), is given by \(\left\{ \text{HCO}_{3}^{-} \right\}+2\left\{ CO_{3}^{2-} \right\}+\left\{ O{{H}^{-}} \right\}-\left\{ {{H}^{+}} \right\}\) where, {} represents concentration in mol/litre. For a water sample, the concentrations of \(\text{HCO}_{3}^{-}=2\times {{10}^{-3}}\) mol/litre, \(\text{CO}_{3}^{2-}=3.04\times {{10}^{-4}}\) mol/litre and the pH of water = 9.0. The atomic weights are: Ca = 40; C = 12; and O = 16. If the concentration of OH- and H+ are NEGLECTED, the alkalinity of the water sample (in mg/litre as CaCO3), is

Alkalinity of water, in equivalent/litre (eq/litre), is given by \(\le

1.	Alkalinity of water, in equivalent/litre (eq/litre), is given by \(\left\{ \text{HCO}_{3}^{-} \right\}+2\left\{ CO_{3}^{2-} \right\}+\left\{ O{{H}^{-}} \right\}-\left\{ {{H}^{+}} \right\}\) where, {} represents concentration in mol/litre. For a water sample, the concentrations of \(\text{HCO}_{3}^{-}=2\times {{10}^{-3}}\) mol/litre, \(\text{CO}_{3}^{2-}=3.04\times {{10}^{-4}}\) mol/litre and the pH of water = 9.0. The atomic weights are: Ca = 40; C = 12; and O = 16. If the concentration of OH- and H+ are NEGLECTED, the alkalinity of the water sample (in mg/litre as CaCO3), is
A.	130.4
B.	100
C.	50
D.	65.2
Answer» B. 100