# Microbiology

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You need 3.5L of 50mM NaCl from your 20X stock. How would you accomplish this:

20X stock __________ml
Pure Water ___________ml

From whatever number I plugged in trying to solve it, I got: 175ml of 20X stock and 3,430ml of Pure Water. Have no idea if those are right. Any help is appreciated.

• Microbiology -

I'm not sure either.

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How would you go about making 250ml of a 20X stock solution of NaCl to dilute later to a final concentration of 50mM?