Chem 330 Unit 10 Chapter 12 & 13.2 HW

HW 10-1Read Sections 12-1 & 12-2

Questions: Page 405 1-5, 7-10

HW 10-2Solubility Curves –Use the attached solubility curve.

1)Which is more soluble over most of the temperature range- potassium iodide or sodium nitrate?

2)Is sodium nitrate or potassium nitrate more soluble at lower temperatures?

3)How many grams of NaCl can be dissolved in 300g of 90C water?

4)How much ammonia gas will bubble out of 100 g of water, if the temperature is increased from 30C to 70C?

5)
How much additional potassium chlorate will dissolve into 250 mL of water, if the temperature is increased from 10C to 100C?

6)How much sodium nitrate will precipitate if a solution of sodium nitrate in 300g of water is cooled from 60C to 40C?

HW 10-3 Molarity Read Section 12-3

  1. Questions Page 406 19-23
  2. 124.5 mL of a 4.52M HCl solution is diluted to 0.750 L. What is the final Molarity and how much water (mL) is added?
  3. 76.32 mL of a 2.75 M sulfuric acid solution is diluted to 1.025 M. What is the final volume and how much water was added?
  4. Frank wants to prepare 750 mL of a 3.25 M sodium hydroxide solution using a 5.00 M standard solution. How many mL of the standard solution and water are required?
  5. Polly adds 175.23 mL of a 4.5 M nitric acid solution to 225.75 mL of a 1.27 M solution. What is the final volume and molarity of the mixture?

HW 10-4Molarity Stoichiometry

  1. Page 407 Questions 24-26
  2. A student reacts 34.54 mL of a 1.234M barium chloride solution with excess aqueous sodium phosphate. How much solid product is made?
  3. How many grams of sodium sulfate will be produced from reacting 345.23 mL of a 1.34 M sodium hydroxide solution with 345.23 mL of 2.50 M sulfuric acid?

HW 10-5Colligative Properties Read Section 13.2

  1. Calculate the freezing point and boiling point of a solution made by dissolving 12.0 grams of glucose (C6H12O6) in 50 grams of water.
  2. Many cooks throw a pinch of salt into water to boil for pasta. What is the boiling point of a solution made by dissolving 5.2 grams of salt in 1245 grams of water?
  3. Calcium chloride and sodium chloride are both used as de-icers in the winter. Which is more effective? Compare the freezing points of calcium chloride and sodium chloride when 150 grams of either is added to 2.47 kg of water.
  4. An aluminum chloride solution boils at 104.5 ºC. What is it’s freezing point(ºC)?
  5. How many liters of ethylene glycol (C2H6O2) should be added to a 6.5 liter car radiator to protect the car from a winter temperature of -20°C? The density of ethylene glycol is 1.11 grams/mL.

HW 10-6

Molar Mass using Colligative Properties

  1. 1420 grams of a molecular substance increase the boiling point of 2.345 kg water by 2.37°C. What is the molar mass of this substance?
  2. A 3.25 liter aqueous solution boils at 100.67°C. The solution was prepared by adding 156.52 grams of a solid to the water. Is this solid: glucose (C6H12O6), salt (NaCl), or calcium chloride?

Osmotic Pressure

  1. Calculate the osmotic pressure of a 0.0500 M magnesium sulfate solution at 22°C.
  2. Calculate the osmotic pressure of a 0.86% salt solution at 37°C.