Name ___________________Date____________Per_________



Name ___________________Date____________Per_________Review: Sections 12.1-12.3The table below lists characteristics of particles in colloids, solutions, and suspensions. Place a check in the column of each mixture whose particles have a particular characteristic. Characteristics of ParticlesColloidsSolutionSuspensionLess than 1 nm in diameterBetween 1 – 1000 nm in diameterLarger than 1000 nm in diameterSettle out if undisturbedSeparated by filtrationScatter lightIf a salt water solution is passed through filter paper, does the solute pass through the filter paper? Explain?What about the solvent? Explain?What is the difference between percent by mass and percent by volume?What is the difference between molarity and molality?How does 0.5 M and 2.0 M NaCl differ?Explain why water is considered the universal solvent.Percent by mass=mass of soluteX 100mass of solutionM=mol of soluteLiters of solutionS1=S2P1P2m=mol of solutekg of solventPercent by volume=Volume of soluteX 100Volume of solutionXA=nAnA + nB M1V1 = M2V2Problems: Using the necessary formula solve each problem. Remember to show all your work to receive credit.According to a lab procedure, you stir 25.0 g of MgCl2 into 550 mL of water. What is the percent by mass of MgCl2 in the solution?What is the molality of a solution that contains 75.3 g of KCl dissolved in 95.0 g of water?How many moles of BaS would be used to make 1500 mL of a 10.0 M solution?What is the mole fraction of sulfuric acid in a solution containing 27.3 g sulfuric acid and 72.7 g water?Calculate the percent by volume of a solution created by adding 75 mL of acetic acid to 725 mL of water. Vinegar contains 5.0 g of acetic acid, in 100.0 mL of solution. What is the molarity of acetic acid in vinegar? How many grams of LiCl are in 275 g of a 15% aqueous solution of LiCl? A chemist needs 15.0 mL of 0.5M NaOH but starts with 3.0 M NaOH. How much 3M NaOH is required for the needed amount of 0.5M solutions?If 0.85 g of gas at 4.0 atm of pressure dissolves in 1.0 L of water at 25oC, how much will dissolve in 1.0 L of water at 1.0 atm of pressure and the same temperature?50482525908000Use the following graph to answer questions. According to the solubility curve, how many grams of potassium chloride can be dissolved at 30?C?Determine if the following solution is supersaturated, saturated or unsaturated: 80 grams of sodium nitrate at 40?C.If 60 grams of potassium nitrate is dissolved in 100 g of water at 50?C, how many more grams must be added to produce a saturated solution of potassium nitrate? If potassium iodide is cooled from 15?C to 0?C, how much solid potassium iodide will come out of solution?Using the graph above:What is the solubility of KCl at 5C?__________What is the solubility of KCl at 25C?__________What is the solubility of Ce2(SO4)3 at 10C?__________What is the solubility of Ce2(SO4)3 at 50C?__________At 90C, you dissolved 10 g of KCl in 100. g of water. Is this solution saturated or unsaturated? How do you know?A mass of 100 g of NaNO3 is dissolved in 100 g of water at 80?C.Is the solution saturated or unsaturated? ___________________As the solution is cooled, at what temperature should solid first appear in the solution? Explain.Use the graph to answer the following two questions:Which compound is most soluble (hold the most solute) at 20 ?C? __________Which is the least soluble (holds the least amount of solute) at 20 ?C? __________Which substance on the graph is least soluble at 10C? __________A mass of 80 g of KNO3 is dissolved in 100 g of water at 50 ?C. The solution is heated to 70?C. How many more grams of potassium nitrate must be added to make the solution saturated? Explain your reasoning.Types of SolutionsOn a solubility curve, the lines indicate the concentration of a __________________ solution - the maximum amount of solute that will dissolve at that specific temperature.Values on the graph ________________________ a curve represent unsaturated solutions - more solute could be dissolved at that temperature.Values on the graph ________________________ a curve represent super saturated solutions - more than the maximum amount of solute is dissolved at that temperature.SolutionSaturated, Supersaturated, or Unsaturated?If unsaturated: How much more solute can dissolve in the solution? a solution that contains 70g of NaNO3 at 30°C (in 100 mL H2O)a solution that contains 50g of KClO3 at 60°C (in 100 mL H2O)a solution that contains 50g of NH4Cl at 50°C (in 100 mL H2O)a solution that contains 20g of KClO3 at 50°C (in 100 mL H2O)a solution that contains 70g of KI at 0°C (in 100 mL H2O)Label the following solutions as saturated, unsaturated, or super saturated. If unsaturated, write how much more solute can be dissolved in the solution. ................
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