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Solutions Review

Solutions Review. Problems have solutions, solutions have problems. Molarity. What volume of a .150 M NaCl solution contains .50 moles of NaCl ? What is the molarity of a solution where .80 moles of sucrose is dissolved in .45 L of solution?

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Solutions Review

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  1. Solutions Review Problems have solutions, solutions have problems.

  2. Molarity • What volume of a .150 M NaCl solution contains .50 moles of NaCl? • What is the molarity of a solution where .80 moles of sucrose is dissolved in .45 L of solution? • How much KBr is contained in .250 L of a 1.7 M KBr solution?

  3. Molality • What mass of a .150 m NaCl solution contains .50 moles of NaCl? • What is the molality of a solution where .80 moles of sucrose is dissolved in .45 kg of solution? • How much KBr is contained in .250 kg of a 1.7 m KBr solution?

  4. % composition • What mass of a 15% NaCl solution contains .50g of NaCl? • What is the % composition of a solution where 80 g of sucrose is dissolved in 450 g of solution? • What is the % composition of a solution where 80 g of sucrose is dissolved in 450 g of water? • How much KBr is contained in 250 g of a 17 % KBr solution?

  5. Mole fraction • What is the mole fraction of a solution where .80 mol of sucrose is dissolved in 4.5 mol of water?

  6. Density • What is the mass of 50 ml of a 1.05 g/ml NaCl solution? • What is the density of a solution where 80mL has a mass of 78 g? • What is the volume of 12 g of a 1.10 g/ml solution?

  7. Colligative properties • What is the molality of a sucrose solution that freezes at -2.40 oC? • What is the molality of a NaCl solution that freezes at -2.40 oC? • What is the molality of a BaCl2 solution that freezes at -2.40 oC?

  8. Colligative properties • What is the molality of a non-electrolyte solution that boils at 102.40 oC? • What is the boiling point of a solution of 41 g of FeCl3 dissolved in 200. g of water?

  9. Colligative properties What is the vapor pressure, at 100oC, of a 4.6 m KCl solution? Ethanol boils at 58oC. If ethanol and water are mixed, with the solution have a higher or lower vapor pressure than water at the same temperature?

  10. Intermolecular forces Compare HCl and F2 • What types of substances? • What types of particles do they have? • What types of IM forces exist within each substance? • Which type of force (q. 3) is strongest? • Which has the higher boiling point? • If both were liquefied, would they dissolve when mixed?

  11. Intermolecular forces Compare NaBr and CCl4 • What types of substances? • What types of particles do they have? • What types of IM forces exist within each substance? • Which type of force (q. 3) is strongest? • Which has the higher boiling point? • Will NaBr dissolve in CCl4?

  12. Hydrates • A bottle from the stockroom has the formula Ca(C2H3O2)2*H2O. Name the compound and calculate the percent water. • What is the formula and % water in strontium chloride hexahydrate? • A sample of hydrated barium chloride has 14.75% water. What is the formula and name of this hydrate?

  13. Electrolytes • Write the reaction of CaCl2 dissolving in water • What is i for CaCl2? • Will a CaCl2 solution conduct electricity? • Will solid CaCl2 conduct electricity? • Will molten (melted) CaCl2 conduct electricity? • A 1.00 m CaCl2 solution has about the same molarity, mass % composition and density as a 1.00 m MgSe solution. How do their boiling points differ?

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