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How many mL of a solution of concentrati...

How many mL of a solution of concentration `100 mg Co^(2+)` per mL is needed to prepare 10 mL of a solution of concentration 20 mg `Co^(2+)` per mL.

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The correct Answer is:
2
`M _(1) V _(1) = M _(2) V _(2) 100 mg xx V _(1) = 20 mg xx 10 mL V _(1) = ( 20 xx 10)/(100) = 2 mL`
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