Fig. Acid/Base Titration.
Screenshot from CHEMIX School.
Chemistry
Software Download
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OVERVIEW
The CHEMIX School Acid/Base
Titration tool provides an interactive workspace to simulate,
analyze, and compare titration curves.
The
main window is divided into three upper frames:
• Simulated Curve
• Experimental Curve
• Spline Smoothing Overlay with Statistics
Common
display options include four checkboxes:
Plotpoints, Polyline, pH(V) Curve, and d(pH)/dV.
Below these are data entry fields for Volume and pH — only the Experimental Curve data is editable.
On
the right side are fields for:
Title, X-Axis, Y-Axis, Experiment Name, List of Experiments, and
Notes.
Use
Save Before or
Save After
after entering a name to store an experiment.
Replace and Delete act on the
currently selected list item.
The lower left area displays graphing results for Simulated, Experimental, and Spline curves, as well as their derivatives.
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SIMULATED CURVE FRAME
Titrant (Upper Section):
Select the titrant from a dropdown list (includes known
substances and their pKa values).
Enter the Concentration (M) and Completion Factor.
The Completion Factor stretches or compresses the titration
curve horizontally to match timing with experimental data.
Analyte (Lower Section):
Choose the analyte from the dropdown list (also includes pKa
values).
Specify its Concentration (M) and Volume (mL).
These values determine the scale and theoretical shape of the
simulated titration curve.
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EXPERIMENTAL CURVE
FRAME
Enter
your real experimental data here.
Provide paired Volume (mL) and pH values — these are plotted
directly on the chart.
Points can be edited or adjusted individually to correct
measurement errors without affecting simulation data.
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SPLINE SMOOTHING
OVERLAY & PARAMETERS
The
spline is generated from user-defined control points placed on
the graph.
Use the checkbox Show
pKa and Equivalence Points to display analytical
markers directly on the plot.
The
Fitted pKa & Equivalence Field lists all computed pKa values
and equivalence points.
Note: The spline requires a strictly monotonic (increasing)
volume trend to produce valid results.
Sensitivity:
Adjustable from 5–100
(5 = low detail, 100 = most sensitive and detailed fitting).
Use Clear to remove all spline control points.
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OTHER OPTIONS
•
Grid – Toggles horizontal and vertical reference lines for pH
and Volume.
• Legends – Solid lines/points indicate primary curves; dotted
lines represent derivatives.
• Background Color – Choose from seven color themes for graph
visibility and contrast.
• pKa and Equivalence Points – Display numerical indicators on
graph overlays.
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GRAPHING OPTIONS
•
Zoom – Right-click and drag to zoom into a region. Right-click
again to unzoom.
• Spline Points – Left-click to add or move a point. Right-click
on a point to delete it.
• Legends – Click and drag to reposition anywhere on the chart.
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DETAILED INFORMATION
Simulated Curve Frame:
The titrant dropdown lists known acids and bases with their pKa
values.
Select a titrant to model its expected neutralization behavior.
The Completion Factor adjusts the simulation horizontally to
better align with real experimental data.
The
analyte dropdown functions similarly but defines the reactant in
the flask.
The entered Volume (mL) and Concentration (M) determine the
shape and scaling of the simulated curve.
Experimental Curve Frame:
This is the only editable dataset in the program.
You can add or modify data points freely to match observed pH
changes.
Edits do not alter or overwrite simulation parameters.
Spline Smoothing &
Statistics:
The spline is built interactively from control points and
provides a smooth fit between experimental measurements.
The accompanying statistics display fitted pKa, pKb, and
Equivalence Points.
Ensure all volume entries increase monotonically to avoid
invalid curve computation.
Sensitivity Control:
Lower sensitivity values yield smoother, less detailed curves.
Higher values produce sharper responses and more precise pKa
detection but will also create false positives from noise.
Grid, Legends & Colors:
Toggle Grid to add reference lines.
Legend color coding: Solid = main curves, Dotted = derivatives.
Seven background color schemes are available for optimal visual
contrast.
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SAVING & MANAGING
EXPERIMENTS
•
Add New – Enter an experiment name, then click Save Before or
Save After.
• Replace – Overwrites the currently selected experiment in the
list.
• Delete – Removes the selected experiment from storage.
• Experiment List – Quickly switch between stored runs for
comparison or continuation.