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Mass of salt added to make a saturated solution (g)
Analyze and Conclude
1 Observing and Inferring What happened to the solubility of the salt as the temperature
increased
2 Comparing and Contrasting The solubility of which of the four salts is the most
temperature dependent
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
3 Predicting What would happen to the solubility of each salt if it was tested at
temperatures above 80 C
4 Thinking Critically Why was the excess ice removed from the water before any salt
was added
Laboratory Manual
Chemistry: Matter and Change 15
Name
Date
Class
LAB 151
LABORATORY MANUAL
5 Error Analysis Compare the results of this lab with the predictions of your hypothesis
Explain possible reasons for any disagreement
Real-World Chemistry
1 In a dishwasher, the temperature of the water is 2 Unlike solids for which solubility in a liquid
very hot Explain why it is better to use hot water in a dishwasher rather than cold water
generally increases with increasing temperature, the solubility of a gas in a liquid usually decreases as the temperature increases Knowing this, explain why you should never heat a can containing a carbonated soft drink
Chemistry: Matter and Change 15
Laboratory Manual
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
Name
Date
Class
LABORATORY MANUAL
Use with Section 153
Freezing Point Depression
issolving a solute in a solvent changes several properties of the solvent, including the freezing point, the boiling point, and the vapor pressure These changes in the physical properties of a solvent by the addition of a solute are known collectively as colligative properties In this activity, the colligative property of freezing point depression will be investigated
Problem
What is the freezing point depression constant of naphthalene
Objectives
Make and use graphs to find the freezing point of naphthalene Measure and use numbers to determine the freezing point depression constant of naphthalene
Materials
naphthalene 1,4-dichlorobenzene acetone 600-mL beaker hot plate large test tube with two-hole rubber stopper thermometer stirring wire tripod stand and gauze beaker tongs balance test-tube clamp
Safety Precautions
Always wear safety goggles, a lab apron, and gloves Avoid breathing in chemical vapors Dispose of chemicals as instructed by your teacher Acetone is flammable It is slightly toxic by ingestion and inhalation Naphthalene is moderately toxic by ingestion, inhalation, and skin contact 1,4-dichlorobenzene is a severe irritant to the eyes, skin, and respiratory tract and mildly toxic by ingestion
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
Pre-Lab
The freezing point depression constant, Kf , is given by Tf K f m where Tf change in freezing point in C, K f is the freezing point depression constant in C kg/mol, and m is the molal concentration in mol/kg
1 Read over the entire laboratory activity Use the 2 The density of water is 10 kg/L What is the
periodic table in your textbook to answer the following questions a What is the molar mass of caffeine (C8H10N4O2) in g/mol b How many moles of caffeine are there in 500 g of caffeine
Laboratory Manual
mass, in kg, of 250 mL of water 3 What is the molal concentration, m, in mol/kg, of a solution of 50 g of caffeine in 250 mL of water 4 The solution in question 3 freezes at 0192 C Because water normally freezes at 0 C, this means that the freezing point has decreased by 0192 C Thus, Tf 0192 C What is the freezing point depression constant of water, Kf
Chemistry: Matter and Change 15
Name
Date
Class
LAB 152
LABORATORY MANUAL
8 When the temperature of the molten naphthalene
Procedure
Part A
1 Add about 400 mL of water to a 600-mL beaker
4 5
Using a hot plate, heat the water until it boils CAUTION: The hot plate and boiling water can cause burns Read the directions in Laboratory Techniques at the beginning of this manual before inserting the thermometer Insert the glass thermometer into one of the holes in the rubber stopper CAUTION: Follow the directions carefully Be sure to lubricate the end of the thermometer with glycerol or soapy water before inserting it into the stopper Do not force the thermometer, as it may shatter in your hand If you have any difficulty, ask your teacher for help Insert the stirring wire in the second hole of the rubber stopper Set the rubber stopper assembly aside Measure the mass of the test tube to the nearest 001g and record the value in Data Table 1 Add about 10 g of naphthalene to the test tube Measure the mass of the test tube and the naphthalene and record the value in Data Table 1 Calculate the mass of the naphthalene and record the value in Data Table 1 Use the test-tube clamp to hold the test tube vertically in the boiling water bath Make sure all of the naphthalene is below the surface of the boiling water When the naphthalene has melted, insert the rubber stopper assembly into the top of the test tube CAUTION: The test tube may be hot The thermometer should be immersed in the naphthalene The stirring wire should loop around the thermometer Move the stirring wire up and down to stir the contents of the test tube Stir the naphthalene as it is being heated until all of the naphthalene has melted Remove the test tube from the boiling water bath by repositioning the test-tube clamp so that it is no longer over the beaker CAUTION: The testtube clamp may be hot Monitor the temperature of the naphthalene as it cools Continue stirring the naphthalene as it cools to ensure that the temperature is constant throughout
has fallen to 900 C, begin recording the elapsed time and the temperature in Data Table 2 The first entry in Data Table 2 will be the temperature of 900 C at an elapsed time of 0 sec Take measurements every 30 s Record all temperatures to the nearest 01 C 9 In order to determine the freezing point accurately, the cooling curve must be observed both above and below the freezing point Thus, continue recording the temperature even after the naphthalene has frozen Stop making measurements once the temperature has dropped below 70 C Part B
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