How do I calculate the percentage error of a stopwatch if the recorded time was 2 hours?
• I am currently writing up a practical on the analysis of aspirin tablets by the back titration method. I have already found the percentage of the 2-ethanoylhydroxybenzoic acid in one tablet. Using this site I found a lot of useful information about the back titration method, however Im still confused as to what is/are the other constituent(s) of the tablet. If you could tell me what they are as well as the purpose for their inclusion, I would be very grateful. Also, after comparing results I would like to know as well why overheating (vigorous boiling) during hydrolysis of aspirin would have an effect on the results. Thank you in advance. • I need to make ten different concentration solutions for my colorimetric analysis. First of all, a 0.2M solution is made, by using series dilution, ten different concentration solution will then be made. I set the volume of the tested solution is 20 cm3. 100% concentration solution: 20 cm3 0.2M solution 90% concentration solution: 18 cm3 0.2M solu
