Name: ___________________________________________ Block:___ Date: ________________
LAB REPORT:
Identifying a Mixture by its Boiling Point
State the Problem:
A. Purpose: State the purpose of the experiment
Research the Problem:
B: Background Info: List 5 things you know about the subject
Form a Hypothesis:
C: Hypothesis: Give your explanation of the problem and explain why you think so
Test the Hypothesis:
D. Materials & Equipment: List the lab supplies & materials needed for this experiment
Name: ___________________________________________ Block:___ Date: ________________
E. Procedure: Explain what was done in this experiment to test your hypothesis
(Drawings of lab set-up are often very helpful in this step)
F. Results: Tell of observations made in the experiment, including data in the form of
clearly explained charts, graphs, & tables
Name: ___________________________________________ Block:___ Date: ________________
Data Table 1: Temperature of Each Mixture at Certain Times*
Samples (grams of salt per 200 mL of water)
Time
0g
5g
10 g
15 g
20 g
25 g
UNKNOWN
30 g
35 g
30 g
35 g
Trial 1
Trial 2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Data Table 2: Boiling Points of Each Mixture*
Salt
Water
Sample
Boiling
Point
0g
5g
10 g
15 g
20 g
25 g
UNKNOWN
Name: ___________________________________________ Block:___ Date: ________________
Graph 1:
Boiling Point v. Amount of Salt
Boiling
Point
Temp
(°C)
Amount of Salt (g) per 200 mL
Draw Conclusions from the Data:
G. Analysis: Look at your data to see if it supported your hypothesis and make sure
you answer the question that started the experiment (HOW MUCH SALT IS IN
THE UNKNOWN?) Support your answer with your data and record any possible
sources of error in your testing methods.
Name: ___________________________________________ Block:___ Date: ________________
CHEAT SHEET & SPECIAL NOTES FOR THIS EXPERIMENT:
LAB REPORT:
Identifying a Mixture by its Boiling Point
A. PURPOSE: The purpose of this experiment is to determine the amount of salt
in an unknown sample by examining its boiling point.
B. BACKGROUND INFO: List things you know about boiling and the temperature at which
it occurs and what exactly happens when a substance boils.
C. HYPOTHESIS: Inspect the unknown & hypothesize what it might be
D. MATERIALS & EQUIPMENT: List all equipment used.
EQUIPMENT & SAFETY CONCERNS:
1.
2.
3.
4.
Goggles must be worn at all times to protect one’s eyes from any stray liquid!!
Do not touch the hotplates or Erlenmeyer Flasks with skin – they will be hot!!
Keep body parts clear of flask openings
Protect the Equipment!!!
a. Keep wires and thermometers away from hot plate surfaces.
b. Do not expose any equipment to rapid temperature changes.
E. PROCEDURE: Describe each step you took to perform this experiment. A good lab
report would explain each detail clearly enough that any person off the street could pick
it up and perform the experiment. For this experiment, be sure to include how the saltwater mixture was made. (ex: Dissolve 35 grams of salt in 200mL of water.)
F. RESULTS: In performing the experiment, each liquid mixture should be placed on the
hotplate at time equal to 0 min. The temperature should be recorded at this time. One
should check the temperature every 1 or 2 minutes and record it in the data table. Once
the temperature of the liquid stops rising, it has reached its boiling point. (To be
absolutely certain, it is a good idea to wait until you have the same temperature reading
for 3 minutes straight.)
A graph is to be made of Boiling Point (on the y-axis) v. Amount of Salt (on the x-axis).
(Share data with your neighbors in order to have more data points.) Draw a line of best
fit through the data points. In the RESULTS section, one should also explain and
reference the tables and graph, and clarify how they assist in organizing information for
study.
G. ANALYSIS: Be sure to accomplish the purpose of the experiment: Answer this
question  How much salt is in the unknown? Explain why using
your data!!!! Also be sure to explain whether your hypothesis was supported or not.
Be sure to list possible causes for error and ideas for improving this experiment.