Ion concentration in water sample obtained from well is tabulated belowIonCa-Mg-Na-HCO-3SO-4Concentration-mgl84101622042Total hardness in mgl as CaCO3 of the water sample is

Total hardness =[Ca^++] × nbsp;eq.wt of CaCO_3eq.wt of Ca^+++[Mg^++]×eq.wt of CaCO_3eq.wt of Mg^++ =84×5020+(10×5012) =25 ...

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Standard VIII

Chemistry

Concentration of Solution

Ion concentra...

Question

Ion concentration in water sample obtained from well is tabulated below

Ion Ca++ Mg++ Na+ $H C O_{3}^{-}$ $S O_{4}^{- -}$

Concentration
$(\frac{m g}{l})$ 84 10 16 220 42

Total hardness (in $\frac{m g}{l} a s C a C O_{3})$ of the water sample is____

250

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Solution

The correct option is A 250
Total hardness = $[C a^{+ +}] \times \frac{e q . w t o f C a C O_{3}}{e q . w t o f C a^{+ +}} + [M g^{+ +}] \times \frac{e q . w t o f C a C O_{3}}{e q . w t o f M g^{+ +}}$
= $84 \times \frac{50}{20} + (10 \times \frac{50}{12})$
=251.67 $\frac{m g}{l} a s C a C o_{3}$

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Ion	Ca++	Mg++	Na+	$H C O_{3}^{-}$	$S O_{4}^{- -}$
Concentration $(\frac{m g}{l})$	84	10	16	220	42

Ion concentration in water sample obtained from well is tabulated below Ion Ca++ Mg++ Na+ HCO−3 SO−−4 Concentration (mgl) 84 10 16 220 42 Total hardness (in mglas CaCO3) of the water sample is____ 250

The correct option is A 250Total hardness =[Ca++]×eq.wt of CaCO3eq.wt of Ca+++[Mg++]×eq.wt ofCaCO3eq.wt of Mg++ =84×5020+(10×5012) =251.67 mgl as CaCo3

Ion concentration in water sample obtained from well is tabulated below

Ion Ca++ Mg++ Na+ $H C O_{3}^{-}$ $S O_{4}^{- -}$

Concentration
$(\frac{m g}{l})$ 84 10 16 220 42

Total hardness (in $\frac{m g}{l} a s C a C O_{3})$ of the water sample is____

250

The correct option is A 250
Total hardness = $[C a^{+ +}] \times \frac{e q . w t o f C a C O_{3}}{e q . w t o f C a^{+ +}} + [M g^{+ +}] \times \frac{e q . w t o f C a C O_{3}}{e q . w t o f M g^{+ +}}$
= $84 \times \frac{50}{20} + (10 \times \frac{50}{12})$
=251.67 $\frac{m g}{l} a s C a C o_{3}$