Handout chapter 13 Concentrations and colligative properties PDF

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1212K Spring 2020

Handout chapter 13_Concentrations

Stroeva

Molarity Unites M or mol/L

M=

1.

mol of solute volume of solution, L

Determine the molarity of a solution formed by dissolving 468 mg of MgI 2 in enough water to yield 50.0 mL of solution.

2. How many milliliters of a stock solution of 11.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3?

Concentrations conversion 3. Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molarity of the HCl, if the solution has a density of 1.20 g/mL.

1212K Spring 2020

Handout chapter 13_Concentrations

Stroeva

Application of Molarity: 4. Which of the following solutions will have the highest concentration of chloride ions? 0.10 M LiCl 0.10 M MgCl2 0..10 M AlCl3 0.05 M CaCl2

Review question. What is the molar concentration of sodium ions in a 0.450 M Na 3PO4 solution?

5. What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO 3)2 in enough water to produce 300. mL of solution?

6. A solution is prepared by dissolving 17.2 g of ethylene glycol (C2H6O2) in 0.500 kg of water. The final volume of the solution is 515 mL. For this solution, calculate: (a) molarity (b) molality (c) percent by mass (d) mole fraction (e) mole percent

1212K Spring 2020

Handout chapter 13_Concentrations

Colligative Properties of Solutions

7. Identify the colligative property: A) vapor pressure lowering B) freezing point depression C) boiling point elevation D) osmotic pressure E) all of the above

8. Which of the following solutions will have the lowest freezing point? A) 0.010 m K Br B) 0.010 m Na2CO3

C) 0.035 m CH3CH2OH

D) 0.015 m BaCl2

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