Chem 152 Lab Prelab Assignment for week 8, the practical midterm lab exam. For t

Question

Chem 152 Lab Prelab Assignment for week 8, the practical midterm lab exam. For the practical, you will be asked to use the skills you have been developing over the course of the semester. You will need to know how to make accurate mass and volume measurements and how to perform molar calculations. There is NO computer graded pre-lab for the practical. Answer the following questions and save as a word or text file. Put a copy of your answers into your lab notebook for use in lab. Go to the D2L dropbox and upload the file to the

Explanation / Answer

moles of acid in titration = 0.255 x3.54/1000 = 0.0009027 , hence original moles of OH- reacted with acid = moles of OH- left after reacting with tablet = 0.0009027, Total OH- moles initially = 0.18 x25/1000 = 0.0045 , OH- moles reacted with tablet = ( 0.0045-0.0009027) = 0.0035973 , aspirin reacted with tablet in 1:1 ratio. so moles of aspirin reacted = 0.0035973 , mass of aspirin = ( 0.0035973 x180.157) = 0.648 grams = 648 mg

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