How to change concentration to make a stock solution?

[shroomysoup]

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I need some help on a quick theoretical situation. If I have 40 mg/mL of gentamicin, how do I make 60 mL of gentamicin stock solution with a final concentration of 4 mg/mL?

 

[njac]

well, how many milligrams total will be in 60mL of 4mg/mL?

 

[Carboxide]

I always use M1V1=M2V2 for these problems:

(60 mL) (4 mg) = (40 mg) (x mL)

(60*4)/40 = 6

You would put 6 mL of the 40 mg/mL solution in with 54 mils of solvent.

 

[Sparda29]

I always use M1V1=M2V2 for these problems:

(60 mL) (4 mg) = (40 mg) (x mL)

(60*4)/40 = 6

You would put 6 mL of the 40 mg/mL solution in with 54 mils of solvent.

This.

 

[kvl1027]

I always use M1V1=M2V2 for these problems:

This Equation is your best friend, love it, cherish it, and never forget it.

C1V1=C2V2 You may see it like this as well.