Q 1166678575.     A sample of hard water contains `20` ppm `Ca^(2+)`. Find the number of moles of `Na_2CO_3` required to remove the hardness of `10` L of water.

A

`5.0×10^-3`

B

`5.0×10^-4`

C

`1.0×10^-4`

D

`1.0×10^-3`

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