Separation of mixtures post lab answers

Name: CH 111 – Introduction to Inorganic and Organic Chemistry Exp. 603 – Separation of a Mixture INSTRUCTIONS 1. Print out these instructions and the report sheet. 2. Read the Background/Introduction section of the lab manual and watch the intro video. Keep in mind that you will not be doing the part of the lab referring to naphthalene sublimation. You will only be separating sand and salt. 3. Watch the videos attached under the instructions. One is the usual YouTube of the lab itself and the other is some extra things from yours truly. 4. Do the calculations on the report sheet below and answer the supplementary questions. Save it as either a .doc or .pdf file and submit it as an attached file under the lab assignment. No labs will be accepted by e-mail. REPORT SHEETS DATA AND OBSERVATIONS 1. 2. 3. 4. 5. 6. Mass of evaporating dish plus sample of unknown mixture Mass of evaporating dish Mass of beaker plus NaCl Mass of beaker Mass of evaporating dish with filter paper plus sand Mass of evaporating dish with filter paper 26.57 g 24.29 g 68.66 g 67.84 g 37.69 g 36.34 g CALCULATIONS AND CONCLUSIONS 1. Calculate the mass of unknown mixture g 2. Calculate the mass of NaCl recovered g 3. Calculate the mass of sand recovered g 4. Calculate the percentage of NaCl in your unknown mixture % 5. Calculate the percent sand in your unknown mixture % 6. Calculate the total mass of sand and salt recovered g 7. Calculate the percent recovery of the components % SUPPLEMENTARY QUESTIONS 1. A student completed the lab but found that the total amount of material recovered weighed more than the original sample. What is the most likely source of error? 2. A package of freshly picked sweet peas weighed 454 g. The peas were freeze dried and the recovered peas weighed 122 g. What was lost and what is the percentage of the compound lost? 3. IN 100 g of sweet peas, there are 14.5 g carbohydrates, 5.7 g sugar, 5.1 g fiber, 5.4 g protein and 0.4 g of fat. Calculate the percent composition for each of these compounds. ...