Question

ESTIONS: 1. Many students do not recover 100% of the original mixture. Describe at least two possible problems that could cause less than 100% recovery of the mixture. 2. A student received a mixture that actually contained 50.0% salt and 50.0% sand. At the end of the experiment, this student calculated that his sample was composed of 45.2% salt and 54.8% sand. What might he have done (or not done correctly) during the experiment to cause this error in his results? 3. A student obtains the following data: Mass of evaporating dish Mass of dish with mixture sample Mass of beaker Mass of beaker with dried salt Mass of evaporating dish with dried sand 25.87 g 28.12 g 146.36 g 147.10 g ??? However, this student spills her sand sample out of the evaporating dish before weighing it. If the student believes in the Law of Conservation of Mass, what should have been the weight of the evaporating dish with the sand in it? Show your work. 4. A student receives a sample of a mixture with three components, solid iodine that is removed first from the mixture by evaporation, solid salt that is dissolved to separate it from the third component. solid sand. The salt and sand are dried and weighed but the iodine escapes as a gas and is not recovered. The student starts with 8.35 g of mixture and recovers 2.37 g of salt and 4.11 g of sand. What is the percent of each component in the original mixture? Show your work. (Attach a separate sheet of paper, if necessary.)

Question 2,3,4 please.

Answer 1

2) the error due to loss of sample material during the experiment.

3)
Mass of Nixture sample = mass of dish with mixture Sample - mass of dish = 28.12-25187 = 2.254 mass of salt = mass of beauer with salt - mass of beaned = 147.10-146.36 0.749 mass of sand = mass of mixture mass of salt = 2.25-0-74 = 1.519

mass of dish with dried sand = 25.87+ 1.51 = 27.389
3) calculation for the percentage of each component is given below in the image,

mass of mixture mass or salt percentage of salt = 8.359. = 2.379 = 2.35 xid 8.35 xioa = 28.38% mass of sand = 4.119 peacentage of sand = 4.11 X 100 49.22 % Remaining is the percentage of lodine = 100-(28.38+49.22) 22.4%