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A water sample contains 1 millimole of M...

A water sample contains 1 millimole of `Mg^(2+)` ion per litre. Calculate the hardness of the water sample in ppm unit.

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1 millimol of `Mg^(2+) equiv1 ` millimole of `"MgCl"_(2)`
`equiv 0.095 " g of MgCl"_(2)`.
`therefore` 1 L or 1000 g or `10^(3)` g of water contains 0.1 g of `"MgCl"_(2)`.
`10^(6)` g of water contains `0.095 xx 103 = 95` g of `"MgCl"_(2)` Degree of hardness of water is 95 ppm.
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