Experiment 1 Post Lab Questions - POST-LAB EXERCISES 1.Show how you calculated your values in Part B 1 A The concentration of the acetylsalicylic acid

# Experiment 1 Post Lab Questions - POST-LAB EXERCISES...

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POST-LAB EXERCISES 1.Show how you calculated your values in Part B: 1 A. The concentration of the acetylsalicylic acid solution in the 50.00 mL sample: y=719.19x-0.0433 0.198=719.19x-0.0433 x=3.36x10 -4 M The concentration of the acetylsalicylic acid solution in the 50.00 mL sample is 3.36x10 -4 M. 2 B. The concentration of the acetylsalicylic acid solution in the 2.00 mL aliquot: M 1 V 1 =M 2 V 2 M 2 =( M 1 V 1 )/(V 2 ) M 2 =((3.36x10 -4 M)(50.00 mL))/(2.00 mL) M 2 =8.39x10 -3 M The concentration of the acetylsalicylic acid solution in the 2.00 mL aliquot is 8.39x10 -3 M. 3 C. Since molarity is an intensive property, the concentration calculated in (B) is also the concentration of the acetylsalicylic acid solution in the 250.00 mL sample. Using the answer from (B) calculate the number of moles of acetylsalicylic acid in the tablet: 4 M=(moles)/(volume in liters) 5 Moles=(M)(Volume in liters) 6 Moles=(8.39x10 -3 M)(0.250 L) 7 Moles=2.10x10 -3 moles 8 D. The mass of acetylsalicylic acid in the tablet expressed in milligrams: 9 (2.10x10 -3 moles)((180.16 g/1mole)=0.378 grams acetylsalicylic acid 10 (0.378 grams)(1 mg/1x10 -3 g)= 378 mg of acetylsalicylic acid 2. How does your experimental value of the mass acetylsalicylic acid in the tablet compare to the  #### You've reached the end of your free preview.

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• Spring '12
• MICHEL
• Errors and residuals in statistics, Transmittance, Acetylsalicylic acid, 0.250 L
• • •  