Back to ASDL
-
To download the media (or a link to the media) in these blog posts simply right click on the illustrations, animations, photos, or video and save to your computer.
Unless otherwise identified, all images are available under the following Creative Commons License.
.
Tag Archives: equivalence point
Selecting an Indicator for a Redox Titration
The most important class of indicators for redox titrations are substances that do not participate in the redox titration, but whose oxidized and reduced forms differ in color. When we add a redox indicator to the titrand, the indicator imparts … Continue reading
Posted in Illustration
Tagged end point, equivalence point, indicator, titration curve, titrimetry
Leave a comment
Equivalence Points for Redox Titrations
For an acid–base titration or a complexometric titration, the equivalence point is almost identical to the inflection point near the middle of the steeply rising part of the titration curve, which makes it relatively easy to locate the equivalence point … Continue reading
Spectrophotometric Titrations
If at least one species in a complexation titration absorbs electromagnetic radiation, we can identify the end point by monitoring the titrand’s absorbance at a carefully selected wavelength. For example, we can identify the end point for a titration of … Continue reading
Posted in Illustration
Tagged end point, equivalence point, spectrophotometric titration, titration curve, titrimetry
Leave a comment
Limitations to Acid-Base Titrations
In an acid–base titration the volume of titrant needed to reach the equivalence point is proportional to the moles of titrand. Because the pH of the titrand or the titrant is a function of its concentration, however, the change in … Continue reading
Determining an Acid Dissociation Constant from a Titration
Another application of acid–base titrimetry is the determination of equilibrium constants. Consider, for example, a solution of acetic acid, CH3COOH, for which the dissociation constant is Ka = [H3O+][CH3COO–]/[CH3COOH] When the concentrations of CH3COOH and CH3COO– are equal, the Ka expression reduces … Continue reading
Finding the Equivalence Point From a Titration Curve
An alternative to using a visual indicator to locate a titration’s end point is to continuously monitor the titration’s progress using a sensor whose signal is a function of the analyte’s concentration. The result is a plot of the entire … Continue reading
Visual Indicators for Acid-Base Titrations
The illustration below shows the relationship between pH and an indicator’s color. The ladder diagram defines pH values where each of the indicator’s two forms the weak acid form, HIn, which in this example is yellow the weak base form, … Continue reading
Posted in Illustration, Photo
Tagged acid-base indicator, acid-base titration, end point, equivalence point, indicator, titrimetry
Leave a comment
Thermometric Titration Curve
An acid-base reaction is exothermic, which means we can follow the titration by monitoring the titration mixture’s temperature as a function of the volume of titrant added. A typical thermometric titration curve is shown here. Prior to the equivalence point, … Continue reading
Strong Acid–Strong Base Titration Curve
Typical acid–base titration curve showing how the titrand’s pH changes with the addition of titrant. The titrand is a 25.0 mL solution of 0.100 M HCl and the titrant is 0.100 M NaOH. The titration curve is the solid blue … Continue reading