ch 10 solutions (colligative...
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![Page 1: Ch 10 Solutions (Colligative Properties)t1lara.weebly.com/uploads/1/6/3/2/1632178/ap_ch10_colligative_properties.pdf(Colligative Properties) Masterson & Hurley • Water is known as](https://reader033.vdocuments.us/reader033/viewer/2022042920/5f644bb42c19046d327d64c4/html5/thumbnails/1.jpg)
Ch 10 Solutions
(Colligative Properties)
Masterson & Hurley
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• Water is known as “the universal solvent”
• This is due to water’s unusual properties, it is:
1. Bent in shape
2. A Highly polar molecule
3. And it causes ionic and polar substances to be soluble, (remember “like dissolves like”)
4. Most ions are soluble in water: cations separate from anions
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• Covalent compounds (like alcohols) do not separate into ions, they stay together because they are covalently bonded.
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• Alcohols become less soluble because of the parent chain, as more carbons are added it becomes less polar (less like water).
• This causes less hydrogen bonding between the alcohol and the water.
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Electrolytes are ionic, nonelectrolytes are covalent
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• The van’t Hoff factor = i
• Ionic compounds have a factor greater than one.
• NaCl = 2 = 1 Na+ and 1 Cl-
• H2SO4 = 3 = 2 H+ and 1 SO42-
• CH3OH = 1 (covalent, does NOT dissociate)
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Ch 10 Solutions
Masterson
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10.1 Concentration Units
10.2 Principles of Solubility
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Memorize!
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• Solution: is a homogeneous mixture, the components are uniformly intermingled.
• Solvent: the substance present in the largest amount (usually the component doing the dissolving).
• Solute: the other substance(s) (usually the component being dissolved).
• Aqueous solutions: are solutions with water as the solvent.
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Common Metric Conversions
WATCH UNITS!
1000 mL = 1 L
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Molarity (M)
• The concentration of a solute is a measure of the amount of solute in a given volume of solution.
• Concentration can have various units, Molarity (M) is commonly used by chemists:
Molarity (M) = moles of solute = mol
Liters of solution L
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• Calculate the standard solution prepared by dissolving 11.5 g of solid NaOH in enough water to make 1.50 L of solution.
• 11.5 g NaOH x 1 mol NaOH = 0.288 mol
40.0 g NaOH
• M = mol = 0.288 mol = 0.192 M NaOH
L 1.50 L
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Concentration of Ions
• If a solution is 1.0 M NaCl it contains 1.0 mol Na+ ions and 1.0 mole of Cl- for example…
• Give the concentration of each type of ion in the following solution:
a. 0.50 M Co(NO3)2
Answer: Co(NO3)2 Co2+ + 2 NO3-
1 mol Co2+ ions = 0.50 M Co2+
2 mol NO3- ions = 2 (0.50 M) NO3- = 1.0 M NO3-
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Calculate the number of moles of Cl- ions in 1.75 L of 1.0 x 10-3 M ZnCl2
• M * L = mol
• ZnCl2 1 mol of Zn2+ + 2 mols of Cl-
• (1.0 x 10-3 M)(1.75 L) = 0.00175 moles
• (0.00175 moles)(2 mol Cl-) = 0.00350 mol Cl-
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• The dilution process is used to save time and space in the lab, often concentrated solutions (called stock solutions) are diluted by adding water to achieve the desired molarity.
• M1 * V1 = M2 * V2
• What volume of 16M H2SO4 must be used to prepare 1.5 L of a 0.10 M solution?
• (0.10 M)(1.5 L) = (16M)(V2)
= 0.0094 L of concentrated H2SO4 or 9.4 mL
• Therefore we must take 9.4 mL of concentrated H2SO4 and dilute to the 1.5 L mark with water…
• (Remember to do what you oughta add acid to water…)
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• In performing calculations associated with dilutions remember that the moles of a solute are not changed by the dilution:
• M1 * V1 = M2 * V2
• M1 * V1 = mol solute before dilution
= mol solute before dilution M2 * V2
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• Heat can either help or hurt a solute to be dissolved to form a solution.
• Heat can act as a reactant or product.
• Heat is given the symbol ∆H
• If ∆H = - it is exothermic, it gives off heat
• If ∆H = + it is endothermic, it absorbs heat (feels cool)
Na+ + NO3- NaNO3 ∆H = +22.8 kJ
22.8 kJ + Na+ + NO3- NaNO3
In this case heat is a reactant & is absorbed.
So to increase the reaction from left to right, we can add heat, known as Le Chatelier’s Principle
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• Now if…
• 2 H+ + SO4 - H2SO4 ∆H = -22.8 kJ
• 2 H+ + SO4 - H2SO4 + 22.8 kJ
In this case heat is a product.
So to increase the reaction from left to right, we can decrease heat, known as Le Chatelier’s Principle
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When The Original Concentration is: Start With:
Mass % 100 g solution
Molarity (M) 1.00 L solution
Molality (m) 1000 g solvent
Mole fraction (X) 1 mol (solute + solvent)
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Compound Molality Weight % Mole Fraction
NaI 0.15
C2H5OH 5.0
C12H22O11 0.15
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10.2 Principles of Solubility
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• Henry’s Law: Cg = k Pg
• Cg = concentration in the solution
• K = constant
• Pg = partial pressure of the gas over the solution.
• Pressure has an effect on solubility for a gas-liquid systems.
• Raising the pressure increases the solubility of a gas.
• Carbonated drinks & the “bends.”
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• The solubility of most solids increases with temperature.
– Sugar and hot vs. iced tea.
• Gases on the other hand, always decrease in solubility with increasing temperature.
– Carbonated drinks on the counter vs. in the fridge.
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10.3 Colligative Properties of NONelectrolytes
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Vapor Pressure
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• Vapor Pressure: Demo of water & isopropyl alcohol.
• The vapor pressure is greater for the alcohol.
• The water molecules have a strong attraction to each other due to hydrogen bonding.
• Alcohol has weaker hydrogen bonding, so they move from a liquid to a gas phase more easily, compared to water.
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• If one has pure water and salt water, the water will move from a liquid to a gas phase much easier than the solution.
• This is because of the vapor pressure of water is more than that of the solution.
• The more Van’t Hoff factors the less the vapor pressure:
• NaCl = 2 = 1 Na+ and 1 Cl-
• H2SO4 = 3 = 2 H+ and 1 SO42-
• CH3OH = 1 (covalent, does NOT dissociate)
• The sulfuric acid would have the least vapor pressure (most difficult to evaporate)
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Raoult’s Law
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• Raoult’s Law:
• The vapor pressure of a solution is directly proportional to the mole fraction of the solvent present.
• Psoln = XsolventP°solvent
• Psoln = is the observed vapor pressure of solution
• Xsolvent =is the mole fraction of the solvent
• P°solvent = is the vapor pressure of pure solvent
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• An ideal solution, a plot of P vs X at constant temperature gives a straight line with a slope of Pº.
• Ideal solutions obey Raoult’s law. Real solutions best approximate the behavior of ideal solutions.
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• The vapor pressure of a solution containing 53.6 g of glycerin in 133.7 g of ethanol is 113 torr at 40ºC.
• Calculate the vapor pressure of ethanol.
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Boiling Point Elevation and
Freezing Point Lowering
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• Boiling point elevation: ∆Tb = kb m
• Freezing point elevation: ∆Tf = kf m
• Antifreeze is 50.0 mL of C2H6O2 (d = 1.12 g/mL) in 50.0 g of water. Calculate the freezing point of mixture. (kf = 1.86ºC/m)
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Osmotic Pressure
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• Some units to consider:
• Pressure: 1 atm = 760 mmHg
= 760 torr
• Temperature: K = 273 + ºC
• Memorize: PV = nRT
• (use this in non-STP)
• R = 0.0821 L atm
mol K
• STP = 0ºC (273 K) & 1 atm
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Summary of Colligative Properties
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Lab Question…
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Ch 10.4 Colligative Properties of Electrolytes
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