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How many milliliters of stock solution should you measure out and dilute with water?

How Many Milliliters Of Stock Solution Should You Measure Out And Dilute With Water class=

Sagot :

1) List known values

Initial concentration (C1): 3.49 ppm

Initial volume (V1): 200.00 mL

Final concentration (C2): 22.0 ppm

Final volume (V2): ?

ppm = mg/L

2) Set the equation

[tex]C1\cdot V1=C2\cdot V2[/tex]

3) Change the units of volume

[tex]L=200.00mL\cdot\frac{1L}{1000mL}=0.200L[/tex]

4) Plug in known values and solve for V2

[tex]3.49\frac{mg}{L}\cdot0.200L=22.0\frac{mg}{L}\cdot V2[/tex][tex]V2=\frac{3.49\frac{mg}{L}\cdot0.200L^{}}{22.0\frac{mg}{L}}=0.03172L[/tex][tex]0.03172L\cdot\frac{1000mL}{1L}=31.73mL[/tex]

If we want to make 200.00 mL of 3.49 ppm solution, we have to measure 31.73 mL of 22.0 ppm solution.

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