1. (+ points, 1 points per pair a. ??1d have the gr 1. Rinse a 50-mL. volumetric
ID: 1041124 • Letter: 1
Question
1. (+ points, 1 points per pair a. ??1d have the gr 1. Rinse a 50-mL. volumetric flask with a small amount of extracting solution (0.05 M HCI+0.05 M H so.) before you start. 2. Calculate the volume of the 50.0 ?g/mL stock solution needed to make 50 mL of each of the five standard dilute solutions. [Remember: Mar x Val Mconc X Veonc StandardCu Conc'n solution (ug/mL)(ug/mL) Fe Conc'n Zn Conc'n Volume of stock solution 0.00 0.50 1.00 2.00 5.00 0.00 0.50 1.00 2.00 5.00 (ug/mL) 0.00 0.50 1.00 2.00 5.00 ? mL (Blank 2 ?? ml. 2? ml. ?? mL 22 ml. Compare your calculations to those of other groups. If there is disagreement, check with your instructor. If there is agreement, record the calculated volumes of stock solution in the data/observations section of your report. 3. Pour about 60 mL of the extracting solution (0.05 M HCI+ 0.05 M H-SO.) into a large beaker. Prepare
Explanation / Answer
Using,
M1V1 = M2V2
where M1, M2 = concentration of concentrated and dilute solution
V1, V2 = Volumes of concentrated and diluted solutions
-STANDARD SOLUTION 1:
50 µg /mL x V1 = 0 x 50mL
V1 = 0 mL
PROCEEDING SIMILARLY AS ABOVE FOR OTHER SOLUTION,
-STANDARD SOLUTION 2:
50 µg /mL x V1 = 0.5 µg /mL x 50mL
V1 = 0.5 mL
-STANDARD SOLUTION 3:
50 x V1 = 1 X 50
V1 = 1 mL
STANDARD SOLUTION 4:
50 x V1 = 2 x 50
V1 = 2 mL
STANDARD SOLUTION 5:
50 x V1 = 5 x 50
V1 = 5 mL
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