could be dissolved in 100 g of water at the given unsaturated, saturated, or supersaturated?
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1 Worksheet: Solubility Graphs Use the provided solubility graph to answer the following questions: For questions 1 4 an amount of solute is given, and a temperature is stated. If all of the solute could be dissolved in 100 g of water at the given temperature, would the resulting solution be unsaturated, saturated, or supersaturated? g KCl at 70 C g KClO 3 at 60 C g NaNO 3 at 10 C g CaCl 2 at 20 C For questions 5 8 a solute and temperature are given. Tell how many grams of each solute must be added to 100 g of water to form a saturated solution at the given temperature. 5. Pb(NO 3 ) 2 at 10 C 7. NaCl at 20 C 6. Ce 2 (SO 4 ) 3 at 50 C 8. K 2 Cr 2 O 7 at 50 C For questions 9 and 10 underline the solution that is more concentrated. 9. At 10 C: a saturated solution of KNO 3 or a saturated solution of CaCl At 50 C: a saturated solution of KNO 3 or an unsaturated solution of NaNO 3 consisting of 90 g of the solute dissolved in 100 g of water. For questions 11 12, show your work and circle your final answer. 11. If 115 g KNO 3 are added to 100 g of water at 35 C, how many grams do not dissolve? 12. What mass of KCl would be needed to form a saturated solution if the KCl was dissolved in 200 g of water at 80 C? 10.12
2 Worksheet: More on Solubility 1. Explain what is meant by the expression like dissolves like. 2. An unknown compound is observed to mix with benzene (a nonpolar solvent) but not with water. Is the unknown compound ionic or covalent? If the unknown compound is a liquid, will it be able to dissolve table salt? Explain: 3. What are the chemical characteristics of a good dry-cleaning solvent? 4. Explain why you are more likely to overdose on vitamin A than on vitamin C. 5. Some industrial plants use water from nearby rivers and streams as a coolant. When the water is returned to the river or stream, the water is warmer than it was originally. This is referred to as thermal pollution. Using your knowledge of solubility, why might this thermal pollution be harmful to fish? 10.13
3 6. After a bottle of carbonated drink has been open for a while, it tastes flat. Explain why. 7. For most solid solutes, the degree of solubility in a liquid solvent (increases, decreases) with an increase in the temperature of the solvent. 8. Describe what happens to the degree of solubility of a gaseous solute in a liquid: a) with a decrease in the temperature of the solvent. b) with an increase in pressure ( Law). 9. The following statement is false: It is not possible to make a saturated solution from a substance that is described as only slightly soluble. Explain why this statement is false
4 Lab: Solubility Datasheet Procedure: 1) Each lab group was assigned a different temperature, calculating the solubility of KCl in water at that temperature. Each group conducted the lab as seen on the video, and their data follows. You are to complete columns #5 and #6, using the provided data from each lab group. Data: #1 #2 #3 #4 #5 #6 #7 Assigned Temperature C cover cover + KCl solution cover + dry KCl Mass of KCl (#4 - #2) Mass of water (#3 - #4) KCl per 100 g of water g g g g g g g g g g g g g g g g g g g g g g g g g g g 2) Column #7 is to be calculated as to express the solubility of KCl in grams per 100 grams of water. Following the equation given, complete column #7 for each group s data. KCl? g KCl = 100 g H2O = water 10.10
5 3) Construct a graph using the vertical axis for grams of solute per 100 g of solvent and the horizontal axis for temperature. Staple your graph to this paper. BE SURE TO USE PROPER SCIENTIFIC GRAPHING TECHNIQUES. Conclusion Questions: 1. The solubility of a solute is the maximum mass of the solute that will dissolve in a certain amount of water at a certain. This is the same as saying that solubility is the concentration of a (unsaturated, saturated) solution of the solute. 2. From your graph, what mass of KCl can be dissolved in 100 g of water at these temperatures? Use dotted lines on your graph to show how you used your graph to determine your answers: a) 25 C b) 55 C 3. For each of the following, tell whether the solution would be saturated, unsaturated, or *crystallizing. (Hint: Plot the point and see whether it lies above, below, or on the best-fit line. Remember that the line represents a solution.) a) 40.0 g of KCl in 100 g of water at 75 C b) 34.0 g of KCl in 100 g of water at 55 C c) 45.0 g of KCl in 100 g of water at 25 C *Normally, crystallization (rather than supersaturation) occurs when more solute is present than what can be dissolved in a given amount of solvent at a given temperature. Crystallization simply refers to the excess solute crystallizing and settling out of the solution. Supersaturation is rare
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