Ch.12 - SolutionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: You need to make a solution that freezes at -125.0 °C. How many grams of CaCl2 salt must you add to 68.0 g of ethanol (C2H6O) to make a solution that freezes at -125.0 °C? Reminder: Pure ethanol freez

Problem

You need to make a solution that freezes at -125.0 °C. How many grams of CaCl2 salt must you add to 68.0 g of ethanol (C2H6O) to make a solution that freezes at -125.0 °C? 

Reminder: Pure ethanol freezes a -114.1 °C. For ethanol: KF = 1.99 °C/m KB = 1.22 °C/m 

Molar masses: Ethanol = 46.07 g/mol; CaCl2 = 110.98 g/mol