CHEM 121 Data Analysis Report
Learning Objectives
Measure pH levels at different concentrations of acids and bases
Compare the effect of dilutions/concentration on strong and weak acids and bases
Plot the change in pH at different concentrations for the acid and for the base on line graphs (not on bar
graphs)
Plot strong and weak acid data on the same graph
Plot strong and weak base data on the same graph
Using the graphed results, Interpret the effect of dilution on pH for acids and bases
INSTRUCTIONS
Plan to set aside 8-12 hours to complete this activity. It involves orientation to the chemistry simulation,
running the simulation, collecting screenshots of every result, plotting the data that you collect, and
answering a set of questions about the data.
*Go to the Acid-Base Solution Simulation at PhET Simulations.
https://phet.colorado.edu/en/simulation/acid-base-solutions
See the image below for an overview of the functions in the Acid Base Solutions simulation.
https://phet.colorado.edu/sims/html/acid-base-solutions/latest/acid-base-solutions_en.html
*Go to the My Solution activity (right side icon)
**Retain default Views > Molecules (Solvent view is an optional addition in the Molecules view)
**You will be selecting Tools of the pH meter as well as the pH paper throughout your data collection
session
Step 1. Use the yellow Reset icon (lower right) to set the Acid-Base Solution activity to default
Step 2. Place the pH reader/sensor into the container, just to the point where it records a value (that is,
it is no longer blank). Or, alternatively, select the pH paper tool and place it into the container for it to
register a color. Compare the color to the pH color strip.
Step 3. Move the Solution Strength toggle to “Strong.” The slide option will disappear. Or, when ready
to record data for the “Weak” solution in Table 1, then Reset and move Solution > Strength to “Weak”
and slide slider all the way left to “weaker.”
Step 4. Set each concentration to a value in the range indicated in parentheses in the first column of
Table 1.
Step 5. Record the measured pH for each concentration in Table 1
Step 6. Record the pH paper color and the associated number for each concentration in Table 1
Step 7. Provide a screenshot in your report for each concentration level for strong and weak solutions
(TOTAL = 12 screenshots). Your screenshot can be either of the pH meter or of the pH paper color
TABLE 1. Data for CHEM 121
Solution
(choose a
concentration
within the range in
parentheses)
Concentration
(moles/liter)
(enter chosen
concentration below)
pH pH paper color
and number
Number of
H3O+ ions
(count them in
the magnifying
class)
Strong Acid #1
(0.005 – 0.008)
Strong Acid #2
(0.05 – 0.08)
Strong Acid #3 (0.5
— 0.8)
Weak Acid #1
(0.005 – 0.008)
Weak Acid #2 (0.05
– 0.08)
Weak Acid #3 (0.5 –
– 0.8)
Solution
(choose a
concentration
within the range in
parentheses)
Concentration
(moles/liter)
(enter chosen
concentration below)
pH pH paper color Number of
OH- ions
(count them in
the magnifying
class)
Strong Base #1
(0.005 – 0.008)
Strong Base #2
(0.05 – 0.08)
Strong Base #3 (0.5
— 0.8)
Weak Base #1
(0.005 – 0.008)
Weak Base #2 (0.05
– 0.08)
Weak Base #3 (0.5 –
– 0.8)
Line Graphs (for example, scatterplot option in Excel)
Submit the two plots below as part of your report
Graph A. Plot Concentration (mol/L) (on X axes) and pH (on y axes) for each strong acid
Graph A. Plot Concentration (mol/L) (on X axes) and pH (on y axes) for each weak acid
Graph B. Plot Concentration (mol/L) (on X axes) and pH (on y axes) for each strong base
Graph B. Plot Concentration (mol/L) (on X axes) and pH (on y axes) for each weak base
***********SEE NEXT PAGE FOR TEMPLATE of YOUR FINAL DATA ANALYSIS REPORT************
DATA ANALYSIS FINAL REPORT TEMPLATE
TOTAL POINTS = 100 POINTS
NAME________________
DATE_________________
Chemistry of the Modern World CHEM 121
CONTENT of Data Analysis Report (Use the format below for your Final Report)
DATA PRESENTATION SECTION
Complete Table 1. Data for CHEM 121 TOTAL TABLE 1: 48 POINTS
(insert here)
TABLE 1. Data for CHEM 121
Solution
(choose a
concentration
within the range in
parentheses)
Concentration
(moles/liter)
(enter chosen
concentration below)
pH pH paper color
and number
Number of
H3O+ ions
(count them in
the magnifying
class)
Strong Acid #1
(0.005 – 0.008)
Strong Acid #2
(0.05 – 0.08)
Strong Acid #3 (0.5
— 0.8)
Weak Acid #1
(0.005 – 0.008)
Weak Acid #2 (0.05
– 0.08)
Weak Acid #3 (0.5 –
– 0.8)
TABLE 1. Data for CHEM 121
Solution
(choose a
concentration
within the range in
parentheses)
Concentration
(moles/liter)
(enter chosen
concentration below)
pH pH paper color
and number
Number of
OH- ions
(count them in
the magnifying
class)
Strong Base #1
(0.005 – 0.008)
Strong Base #2
(0.05 – 0.08)
Strong Base #3 (0.5
— 0.8)
Weak Base #1
(0.005 – 0.008)
Weak Base #2 (0.05
– 0.08)
Weak Base #3 (0.5 –
– 0.8)
Provide a screenshot in your report for each concentration level (12 screenshots total). Your screenshot
can be either of the pH meter or of the pH paper color, either is fine. Insert here.
1 POINT EACH for 12 SCREENSHOTS = 12 POINTS
Strong Acid #1 (0.005 – 0.008)
(Insert screenshot)
Strong Acid #2 (0.05 – 0.08)
(Insert screenshot)
Strong Acid #3 (0.5 — 0.8)
(Insert screenshot)
Weak Acid #1 (0.005 – 0.008)
(Insert screenshot)
Weak Acid #2 (0.05 – 0.08)
(Insert screenshot)
Weak Acid #3 (0.5 — 0.8)
(Insert screenshot)
Strong Base #1 (0.005 – 0.008)
(Insert screenshot)
Strong Base #2 (0.05 – 0.08)
(Insert screenshot)
Strong Base #3 (0.5 — 0.8)
(Insert screenshot)
Weak Base #1 (0.005 – 0.008)
(Insert screenshot)
Weak Base #2 (0.05 – 0.08)
(Insert screenshot)
Weak Base #3 (0.5 — 0.8)
(Insert screenshot)
GRAPHS
Plot Concentration (mol/L) (on X axes) and pH (on y axes)
Line Graph A Strong vs Weak Acid
(insert here)
Line Graph B Strong vs Weak Base
(insert here)
10 POINTS EACH for 2 LINE GRAPHS = 20 POINTS
SHORT ANSWER SECTION TOTAL = 20 POINTS
1. Compare and contrast the line graphs between strong and weak solutions (4 POINTS)
2. Compare and contrast the line graphs between acids and bases (4 POINTS)
3. Compare and contrast the number of hydronium ions (H3O+) (or hydronium ion concentration)
[for acids] between strong and weak solutions (4 POINTS)
4. Compare and contrast the number of hydroxide (OH-) ions [for bases] between strong and weak
solutions (4 POINTS)
5. Concluding comments (Share what you have learned about acids and bases by conducting this
simulation) (4 POINTS)
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