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A sample of hard water was found to ...

A sample of hard water was found to contain 278 ppm of calcium ion . Into 1.00 L of this water , `1.06` g of `Na_(2)CO_(3)` was added . What is the new concentration of `Ca^(2+)` ion in ppm ? Density of all solution is `1.0 g//cc and K_(sp) ` of `CaCO_(3)` is `4.5 xx10^(-9)`

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`0.059 ` ppm of `Ca^(2+)`
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