Q.

How many mL of a solution of concentration 100 mg Co2+ per mL is needed to prepare 10 mL of a solution of concentration 20 mg Co2+ per mL.

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answer is 2.

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Detailed Solution

M1V1=M2V2 (Atomic weight of Co=58.93g ) 100mg5893mg×V1=20mg5893mg×10mLV1=20×10100=2mL
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How many mL of a solution of concentration 100 mg Co2+ per mL is needed to prepare 10 mL of a solution of concentration 20 mg Co2+ per mL.