1. A sample of paracetamol (acetaminophen) from a pharmaceutical manufacturer was analysed by dissolving 20.0mg of sampl
Posted: Sat Jul 09, 2022 12:22 pm
1. A sample of paracetamol (acetaminophen) from a pharmaceuticalmanufacturer was analysed by dissolving 20.0mg of sample in 2ml ofmethyl alcohol and then bringing this solution to a total volume of100ml with water. The sample was then analysed using a UV-VisibleSpectrophotometer and the result compared with that of the sametest performed on the same amount of a paracetamol standard knownto be 100% pure. The test sample gave a reading of 0.0549absorbance units while the standard gave a reading of 0.0558. Whatis the quantity of paracetamol in the test sample and what is itspercentage purity?
2. The calcium content of a 200 mL sample of natural springwater was determined by precipitating it as calcium oxalate(CaC2O4). The precipitate was then filtered, washed, and ignited ina crucible with an empty mass of 26.6002 g, this left CaO. The massof the crucible plus CaO (56g/mol) was 26.7134 g. Calculate theconcentration of Ca (40.0g/mol) in the water in units of grams per100 mL.
3. Imagine that you work for an Environmental Consultancy. Yourclient is a local council. They wish to develop a plot land forhousing but need to test the soil to ensure that it is safe tobuild on. There is no obvious source of pollution but details ofthe previous use of the land are sketchy. Your company is taskedwith undertaking the sampling. Discuss what features wouldinfluence your sampling procedure including: *Frequency of sampling*Storage of samples; *Number of samples taken each time, and*Location for sampling, etc. *Any other factors. Please explainyour reasoning for each. appreciate your help in understanding
2. The calcium content of a 200 mL sample of natural springwater was determined by precipitating it as calcium oxalate(CaC2O4). The precipitate was then filtered, washed, and ignited ina crucible with an empty mass of 26.6002 g, this left CaO. The massof the crucible plus CaO (56g/mol) was 26.7134 g. Calculate theconcentration of Ca (40.0g/mol) in the water in units of grams per100 mL.
3. Imagine that you work for an Environmental Consultancy. Yourclient is a local council. They wish to develop a plot land forhousing but need to test the soil to ensure that it is safe tobuild on. There is no obvious source of pollution but details ofthe previous use of the land are sketchy. Your company is taskedwith undertaking the sampling. Discuss what features wouldinfluence your sampling procedure including: *Frequency of sampling*Storage of samples; *Number of samples taken each time, and*Location for sampling, etc. *Any other factors. Please explainyour reasoning for each. appreciate your help in understanding