Drill: Name & describe each of the 7 crystal structures

Drill: Draw LDDs for: BF 3 NH 3 BeCl 3 C 3 H 6 H 3 PO 4 H 2 CO 3

Drill: Draw LDDs for: C6H8C6H8

Drill: Draw LDD for: C 3 H 5 NO

CHM II Test Friday

CHM II HW Read: Chapter 14 Work Problems 25 & 29 on page 585

Solutions

Solution Homogeneous mixture made up of at least one solute dissolved in the solvent

Solute Substance being dissolved Portion in lesser molar amount

Solvent Substance doing the dissolving Portion in greatest molar amount

Colloid Slightly larger particles Light passes & particles stay suspended

Suspension Even larger particles Particles block or reflect light

Tyndall Effect Because light reflects off suspended particles, the light ray can be seen from the side

Size Comparison Solution < Colloid Colloid < Suspension

Soluble When one substance (solute) dissolves in another (solvent)

Solubility The amount of one substance (solute) dissolved in another (solvent)

Concentration The amount of solute dissolved into solution

Concentrated Solution A solution with a relatively large amount of solute dissolved

Dilute Solution A solution with a relatively small amount of solute dissolved

Saturated Solution A solution with the maximum amount of solute dissolved in the solution

Unsaturated Solution A solution with less than the maximum amount of solute dissolved in solution

Supersaturated Solution A solution with greater than the maximum amount of solute dissolved in solution

Solution Measures Concentration –Molarity –Molality –Mole Fraction

Percent Solution Mass of one portion per the total mass, all times 100 % % soln = m a /m total x 100 %

Drill: Define & give units for: –Molarity –Molality –Mole Fraction

Molarity Moles of solute per liter of solution M = moles solute /L soln

Molality Moles of solute per kilogram of solvent mo = moles solute /kg solvent

Mole Fraction Moles of one portion per total number of moles in the solution X = moles a /moles soln

Calculate the molarity of a 250 mL solution containing 5.0 g NaOH dissolved in water

Calculate the molality of 69 g of C 2 H 5 OH dissolved in mL of water

Calculate the mole fraction of each portion when 92 g of C 2 H 5 OH dissolved in 144 mL of water

Drill: Calculate the mass of KI required to make 250 mL of M KI.

Review Drill Review HW

Calculate the molality & mole fraction of a solution containing 46 g of C 2 H 5 OH dissolved in 1782 mL of water

Chm II Homework: Problems: 31 & 38 Page: 585 & 586

AP Chm HW: Problems: Page:

Colligative Properties Properties dependent only on the concentration of particles in solution

Examples Vapor pressure Boiling & Freezing points Osmotic pressure

Vapor Pressure VP solution = (VP solvent )(X solvent ) X = mole fraction VP = vapor pressure

Boiling & Freezing  T = i moK  T = change in BP or FP i = ionic activity K = BP or FP constant

Osmotic Pressure  = i MRT  = osmotic pressure i = ionic activity M = Molarity

Calculate the vapor pressure of a solution containing 150 g C 5 H 10 O 5 in 162 mL of water at 30 o C

Drill: Calculate the VP of a solution containing 36 % m/m glucose (C 6 H 12 O 6 ) in water at 29 o C: (VP water = 30.0 mm Hg )

Calculate BP & FP of 60.0 g of NaOH in 250 mL water K BP = o C/mo K FP = o C/mo

Calculate the osmotic pressure of a solution containing 12 g of NaOH dissolved in 250 mL solution at 27 o C

Chm II Homework: Problems: 47 & 87 Page:

AP Chm HW: Problems: 31, 35, & 39 Page: 298

Calculate the vapor pressure of a solution containing 120 g C 3 H 7 OH in 144 mL of water at its BP.

Drill: Calculate the mass of lead(II)nitrate required to make 250 mL of 0.40 M Pb(NO 3 ) 2

Test on Monday on Bonding, Lewis Dot Diagrams, & Solution Chemistry

Draw LDDs for: BH 3 NCl 3 CF 4 C 3 H 6 SO 3 SO 3 -2

Calculate the osmotic pressure of a solution containing 12 g of C 4 H 8 O 4 dissolved in 50.0 mL solution at 27 o C (VP = 26.7 mmHg)

Clausius-Claperon Eq H v = R ln (T 2 )(T 1 ) P 2 (T 2 – T 1 ) P 1

VP benzene Temp ( o C) Calculate H v for benzene:

Calculate the osmotic pressure of a solution containing 29.9 g of CoBr 3 dissolved in 7500 mL solution at 27 o C

Calculate the vapor pressure of a solution containing 12.0 g C 3 H 8 O in 14.4 mL of water at its BP. VP solvent = 1.0 Atm

Calculate the molality of a solution that is 33.1 % by mass Pb(NO 3 ) 2 in water

Drill: Calculate the osmotic pressure of 0.88 g of CO 2 in 750 mL of soln at 27 o C

Test Tomorrow

300 g C 3 H 6 NF was dissolved in 500 g C 6 H 12 O at 27 o C making a g/mL solution. Calculate X, mo, M, , VP, BP, & FP.

180 g C 3 H 8 O was dissolved in 180 mL H 2 O at 27 o C making a 1.5 g/mL solution. Calculate X, mo, M, , VP, BP, & FP.

A 1.2 g/cm 3 aqueous solution is 20.0 % by mass NaOH at 27 o C. Calculate: X, mo, M, , & MP

Calculate the molecular mass of a covalent compound dissolved in an aqueous solution to make it 25 % by mass when it boils at o C

AP Homework: Read: Chapter 11 Power Point: 19

Chm II Homework: Read: Chapter 15 Power Point: 16