If you want to make 200.00 mL of a solution that is 1.75 ppm and you have a 12.0 ppm stock solution, how much of the stock solution should you measure out and dilute with water?
Answer :
Concentration of stock solution ( C1) = 12 ppm
Volume of stock solution (V1) = ?
Concentration of given prepared solution ( C2) = 1.75 ppm
Volume of given prepared solution ( V2) = 200 ml
From Molarity equation :
C1 * V1 = C2 * V2
V1 = C2 * V2 / C1 = 1.75 * 200 / 12 = 17.5 ml
Volume of stock solution required = 17.5 ml
Volume of water required = volume of given prepared solution - volume of stock solution = 200 - 17.5 = 182.5 ml
Volume of water required = 182.5 ml
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