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Tag Archives: titration curve
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
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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
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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
Locating a Titration’s Equivalence Point
For most acid–base titrations the inflection point, the point on a titration curve having the greatest slope, very nearly coincides with the equivalence point. The red arrows in the following figure for example, indicate the equivalence points for the titrations … Continue reading
Drawing an Acid-Base Titration Curve
This set of illustrations shows the steps for quickly sketching an good approximation of the titration curve for the titration of 50.0 mL of 0.100 M CH3COOH with 0.200 M NaOH: (a) determine the equivalence point volume—in this case 25 … Continue reading
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
p-Function
When the concentration of a species spans many orders of magnitude, it is difficulty to display how that species’ concentration changes during a chemical reaction. Such is the case here for the titration of HCl with NaOH. The y-axis on … Continue reading