Calculating Volumes to Prepare Standard Solutions with KSCN

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SUMMARY

This discussion focuses on calculating the volumes of reagents needed to prepare standard solutions of potassium thiocyanate (KSCN) at specific concentrations. The participants emphasize the importance of using dilution principles based on mass conservation to determine the required volumes. For instance, to prepare a 25.0 mL solution with a concentration of 2 x 10-4 M, a volume of 2.5 mL of the concentrated solution is calculated using the formula (C1V1 = C2V2). The discussion highlights the systematic approach to solving dilution problems in chemistry.

PREREQUISITES
  • Understanding of dilution principles in chemistry
  • Familiarity with concentration calculations
  • Knowledge of the formula C1V1 = C2V2
  • Basic skills in preparing standard solutions
NEXT STEPS
  • Study the concept of mass conservation in chemical solutions
  • Learn about preparing standard solutions in laboratory settings
  • Explore advanced dilution techniques for varying concentrations
  • Review examples of concentration calculations in chemistry textbooks
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Chemistry students, laboratory technicians, and educators involved in teaching or learning about solution preparation and dilution calculations.

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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