Calculating Volumes to Prepare Standard Solutions with KSCN

AI Thread Summary
To prepare standard solutions with KSCN, the volume of each reagent must be calculated based on the desired concentration and total volume of 25.0 mL. The discussion emphasizes that this is a straightforward dilution problem, relying on mass conservation principles. One participant calculated the required volume for the first row using the formula for dilution, confirming that 2.5 mL of the reagent is needed for a concentration of 2 x 10^(-4) M. The conversation highlights the importance of accurate calculations over guesses in determining reagent volumes. Overall, the focus is on precise calculations to ensure the correct preparation of standard solutions.
brushman
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Calculate the volume of each reagent required to prepare 25.0 mL of each standard solution at the specified KSCN concentration. Fill in the rest of the table (attached).

My complete guess is that the solution II needs to be incremented by 2.5 ml each time.
 

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Thanks. For the first row I did (2 x 10^(-5))(25) = x (2 x 10^(-4)) and got x = 2.5 so it seems to be working.
 

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