A Gran plot is used to predict the equivalence volume or endpoint of a potentiometric or acid-base titration without reaching the endpoint. Typically, titration data is collected as a function of the titrant's volume up to a point less than the equivalence volume and then transformed into a linear format. The straight line is extended to the x-axis, indicating the necessary titrant volume to achieve the equivalence point.

For potentiometric titration, the Gran plot is created by plotting the volume-corrected base-10 antilogarithm of the measured electrode potential (E) against the titrant volume. The equivalence volume can be predicted by fitting the best line through the data points and extrapolating back to the x-axis. Likewise, using the Gran plot equation for a weak acid-strong base titration produces a straight line, where the slope of the line is equal to the negative activity-corrected acid dissociation constant, and the x-intercept corresponds to the titrant volume at the endpoint.

来自章节 10:

article

Now Playing

10.11 : End Point Prediction: Gran Plot

Electrochemical Analyses and Redox Titration

84 Views

article

10.1 : Electrochemistry: Overview

Electrochemical Analyses and Redox Titration

317 Views

article

10.2 : Electrodes: Overview

Electrochemical Analyses and Redox Titration

204 Views

article

10.3 : Interfacial Electrochemical Methods: Overview

Electrochemical Analyses and Redox Titration

136 Views

article

10.4 : Potentiometry: Overview

Electrochemical Analyses and Redox Titration

222 Views

article

10.5 : Potentiometry: Types of Electrodes

Electrochemical Analyses and Redox Titration

243 Views

article

10.6 : Potentiometry: Membrane Electrodes

Electrochemical Analyses and Redox Titration

192 Views

article

10.7 : Redox Titration: Overview

Electrochemical Analyses and Redox Titration

139 Views

article

10.8 : Redox Titration: Iodimetry and Iodometry

Electrochemical Analyses and Redox Titration

329 Views

article

10.9 : Redox Titration: Other Oxidizing and Reducing Agents

Electrochemical Analyses and Redox Titration

90 Views

article

10.10 : Potentiometric Titration: Overview

Electrochemical Analyses and Redox Titration

183 Views

article

10.12 : Electrogravimetric Analysis: Overview

Electrochemical Analyses and Redox Titration

89 Views

article

10.13 : Coulometry: Overview

Electrochemical Analyses and Redox Titration

86 Views

article

10.14 : Controlled-Potential Coulometry: Electrolytic Methods

Electrochemical Analyses and Redox Titration

64 Views

article

10.15 : Controlled-Current Coulometry: Overview

Electrochemical Analyses and Redox Titration

86 Views

See More

JoVE Logo

政策

使用条款

隐私

科研

教育

关于 JoVE

版权所属 © 2025 MyJoVE 公司版权所有,本公司不涉及任何医疗业务和医疗服务。