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Take 13.0 mL of the first solution ( 50 ug/mL) and dilute it up to 50.0 mL, you'll get the second solutionconcentration ( 13 ug/mL).

Proof: 13.0 mL x 50 ug/mL of 1st = 50.0 mL x 13 ug/mL of in 2nd

[Control: by units] 650 ug in 1st = 650 ug in 2nd

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Q: How do you dilute a 50 micrograms per milliliter sample to a 13 micrograms per milliliter sample?
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