In Lab 11 you make a stock solution of salicylic acid, and then four dilutions.

Question

In Lab 11 you make a stock solution of salicylic acid, and then four dilutions. The stock solution is made by diluting 10.00 ml of 1.250 times 10^-2 M salicylic acid in 100.00 mL of solution. You then make the four dilutions as follows: Dilution #1 = 40.00 mL of stock diluted to 100.00 mL Dilution #2 = 30.00 mL of stock diluted to 100.00 mL Dilution #3 = 20.00 mL of stock diluted to 100.00 mL Dilution #4 = 10.00 mL of stock diluted to 100.00 mL Determine the concentrations of the stock solution and four dilutions and enter them in the tables below.

Explanation / Answer

preparation of stock solution :

C1V1 = C2V2

1.25 x 10^-2 x 10 = C2 x 100

=> concentration of stock solution = C2 = 1.25 x 10^-3 M

dilution #1)

C1V1 = C2V2

1.25 x 10^-3 x 40.00 = C2 x 100.00

=> C2 = 0.5 x 10^-3 M

dilution #2)

C1V1 = C2V2

1.25 x 10^-3 x 30.00 = C2 x 100.00

=> C2 = 0.375 x 10^-3 M

dilution #3)

C1V1 = C2V2

1.25 x 10^-3 x 20.00 = C2 x 100.00

=> C2 = 0.25 x 10^-3 M

dilution #4)

C1V1 = C2V2

1.25 x 10^-3 x 10.00 = C2 x 100.00

=> C2 = 0.125 x 10^-3 M

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