water c 1 flashcards pp. 45-53. use the graph on pg. 46 to answer some of these questions
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Water C 1 Flashcardspp. 45-53
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Use the graph on pg. 46 to answer some of these
questions.
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Give an example of a solute and a solvent.
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Solvent: waterSolute: kool-aid (or
sugar)ORSolvent: laundry detergentSolute: grease stain
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If you have 60g KNO3 at 40oC in 100g of water, is the solution…saturated, unsaturated or supersaturated?
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Saturated
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If you have 80g of KNO3 at 10oC, 100g of water, is the solution…saturated, unsaturated or supersaturated?
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Supersaturated
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If you have 70g of KNO3 at 80oC, in 100g of water, is the solution…saturated, unsaturated or supersaturated?
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Unsaturated
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What is the minimum amount of water needed to dissolve 70g KNO3 at 80oC?
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At 80oC
160g KNO3 = 70g KNO3
100g H2O Xg
x = 43.8g
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What mass of KNO3 will dissolve in 100g of water at 10oC?
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About 20 g KNO3
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How much KNO3 will dissolve in 250g of H2O at 50oC?
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At 50oC
80g = X 100g 250g
x = 200g KNO3
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If you have 50g KNO3 at 50oC, in 100g H2O how much more KNO3 must be added to saturate the solution?
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80g is saturated so subtract 50g and 30g more of KNO3 must be added.
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An alka-seltzer tablet is placed in water and then the medicine is consumed.Identify the 3 underlined substances as solute, solution and solvent.
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Solute - Alka-seltzer tablet
Solvent - water
Solution - medicine
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What is the percent concentration of a solution that contains 45g of weed killer in 1500g of water?
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45 x 100(45g + 1500g)
=2.9%