Question

What volume of 20 M NaCl do you need to dilute to give a total volume of 10 ml of 40 μM NaCl? What equation do you use and how do you solve this problem? (Please Show Work)

Incorrect 40 μL
Incorrect 200 μL
Incorrect 20 mL
Incorrect 200 mL
Correct: 20 μL

Answer 1

Equation=M1V1 = M2V2.

M1- concentration in molarity of the Intial concentrated solution=20M=20 moles/litre

M2 - concentration in molarity of the Final dilute solution=40micro M=40*10 -6 M=40*10 -6moles/litre(1M=106microM)

V1- volume of the concentrated solution=?

V2 - volume of the dilute solution=10 ml

M1V1=M2V2,Substituting the Value

20*V1=(40*10 -6)*10=40*10*10 -6

V1=(400/20)*10 -6=20 *10 -6 ml=20*10 -6 ml=2*10-5 ml=2*10-5*103 microlitre(1 ml =1000microlitre)

=0.02 Microlitre.

NB:From the Given Values the answer will be 0.02 microlitre.

To get 20 Microlitre there may be some correction in the question.(if Instead of 40 μM NaCl,If this is 40mM Then You will 20 Microlitre)Please check your Question.

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