FREEZING POINT DEPRESSION LAB

Slides:

Advertisements

Similar presentations

CALCULATIONS INVOLVING COLLIGATIVE PROPERTIES

Advertisements

Colligative Properties of Nonelectrolytes. Colligative Properties Changes in colligative properties depend only on the number of solute particles present,

Colligative Properties of Solutions

Using Freezing Point to determine Molar Mass Objectives: To measure freezing points of known concentrations of solutions To use freezing point to determine.

Example Calculations involving Colligative Properties (Solution Properties)

Molecular Mass by Freezing Point Depression Background Vapor Pressure  The melting and freezing points for a substance are determined by the vapor pressure.

Calculations Involving Colligative Properties. Introduction We now understand colligative properties. To use this knowledge, we need to be able to predict.

Colligative Properties The presence of a solute affects the properties of the solvent. –Example: Freezing point of water Colligative properties depend.

Colligative Properties of Solutions Colligative properties = physical properties of solutions that depend on the # of particles dissolved, not the kind.

Colligative Properties of Solutions. How do you get from this…

Properties of Solutions Chapter 18 Lesson 3. Solution Composition Mass percentage (weight percentage): mass percentage of the component = X 100% mass.

Determining the Molecular Mass by Freezing Point Depression

A brief introduction to freezing point depression THE COLLIGATIVE PROPERTIES OF MOLALITY AND FREEZING POINT DEPRESSION grownextgen.org.

1 Concentration of Solute The amount of solute in a solution is given by its concentration The amount of solute in a solution is given by its concentration.

1 Colligative Properties of Solutions Colligative properties are properties that depend only on the number of solute particles in solution and not on the.

UNIT 9 Molality & Colligative Properties. Molarity is the most widely used form of quantitative concentration, but it is not the only one. There are actually.

Freezing Point Depression When the rate of freezing is the same as the rate of melting, the amount of ice and the amount of water won't change. The.

Dilution Review Take 5 minutes with your partner to solve the scenario below. Oops! I spilled 100mL of water into my 300mL of 6 M HCl. Is my solution too.

Calculations Involving Colligative Properties Freezing Point Depression and Boiling Point Elevation Calculations.

Percent by mass, mole fraction, molarity, and molality

Lab Notebooks Courtesy of Pleasant Valley High School Chemistry.

Midterm I Review Thursday, Feb. 08: Huggins 10, 7-8 pm Conflicts: ELL 221, 6-7 pm No class on Friday, Feb. 09!

Solutions Homogeneous Mixture of 2 or more Substances.

Unit # 4 Colligative Properties.. Colligative Properties - Properties that depend on the concentration of solute molecules or ions in solution, but do.

Molar Mass and Freezing Point Depression Lab Prep.

Freezing Point Depression Lab Attempts to correctly record and report data.

Mini-Unit: Colligative Properties

Learning Target: Refine the design of a chemical system by specifying a change in conditions that would produce increased amounts of products at equilibrium.

Discussion: Colligative Properties Students will be able to: Explain how dissolved solutes affect the boiling and freezing points of solutions.

Determining the Molecular Mass from the Freezing Point.

Solutions Chapter 16. Solutions A solution is a homogenous mixture of 2 substances.

Colligative Properties

Chem-To-Go Lesson 37 Unit 9 COLLIGATIVE PROPERTIES.

Changing melting and boiling points. Putting salt on sidewalks and roads in the winter helps because it lowers the freezing point of water by a few degrees.

Unit # 4 Colligative Properties.. Colligative Properties - Properties that depend on the concentration of solute molecules or ions in solution, but do.

Calculations Involving Colligative Properties. Objectives When you complete this presentation, you will be able to o calculate the molality of a solution.

Chapter 13 Properties of Solutions Preliminary Lesson For PRACTICE FRQ’S Worksheet 1998 B.

CHAPTER 12: Concentration Terms for Solutions Concentration = Amount solute/amount solvent Some Concentration Terms are Temperature Sensitive.

Chapter 19: Molality and Colligative Properties Chapter 14 —Big Book p. 487 & 14.1 (p ) HW Ch. 19 Blue Book: #1-17, 19 Chapter 14 —Big Book p.

COLLIGATIVE PROPERTIES

Freezing Point Depression Experiment

Solutions Review.

Solutions Review.

Colligative Properties of Solutions

V. Colligative Properties

Chemistry 16.4.

Colligative Properties

Colligative Properties of Nonelectrolytes

III. Colligative Properties

Unit 6: Solutions and Kinetics

BELLWORK 4/5/2018.

Chapter 18 - Solutions.

Colligative Properties of Solutions

Colligative Properties

Freezing Point Depression

Colligative Properties

Chapter 13-2 Colligative Properties of Solutions

8.3 Colligative Properties Objective S3

Lesson 6.1: Solutions and Concentration

Molality and Colligative Properties’

III. Colligative Properties (p )

Chapter 16 Review =“Solutions”.

Colligative Properties

BELLWORK 4/6/2017.

Solutions Vocabulary Saturated solution Solubility

Colligative Properties

Colligative Properties

Calculations Involving Colligative Properties

Presentation transcript:

FREEZING POINT DEPRESSION LAB INTRODUCTION: DISCUSS FREEZING POINT DEPRESSION, MOLALITY, COLLIGATIVE PROPERTIES, SOLUTE, SOLVENT. DATA, PRESENT A TABLE OF YOUR COOLING CURVE OF LAURIC ACID WITH BHT. PRESENT THE TABLE OF THE NORMAL FREEZING CURVE OF LAURIC ACID (mp about 43 degrees). RESULTS; GRAPH ON EXCELL OR OTHER GRAPHING PROGRAM BOTH COOLING CURVES ON THE SAME GRAPH, USE DIFFERENT COLORS OR LINE PATTERNS FOR EACH CURVE. DISCUSS THE ▲T OF FREEZING.

▲TF = kF m FREEZING POINT DEPRESSION LAB Find molality by dividing grams of BHT used by the grams of lauric acid used– (converted to Kg by dividing by 1000) NOTE. GFM of BHT is 220.0 g/mol MOLALITY(m) = MOLES SOLUTE (BHT IN THIS LAB) Kg of SOLVENT (Lauric Acid) Change in freezing point between pure lauric acid + BHT (from your data from the two cooling curves) MOLALITY ▲TF = kF m The freezing point depression constant, you should calculate this from your data

SOME POINTERS: 1-The ▲ T is the difference between your depressed freezing point of the lauric acid-BHT solution and pure lauric acid which melts at about 43o C. 2- Convert the moles of BHT to moles. Then convert the grams of your lauric acid sample to Kg by dividing by 1000. 3- Solve for Kf. OBSERVATIONS: list any observations, compare the freezing point of the pure lauric acid to the lauric-BHT solution results verbally. DISCUSSION AND CONCLUSION. Look up the kf of lauric acid and calculate % error.