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Related Concept Videos

Titrimetric Methods: Types and Commonly Used Strategies01:08

Titrimetric Methods: Types and Commonly Used Strategies

929
In chemistry, titrimetric methods are broadly classified into three types: volumetric, gravimetric, and coulometric. Volumetric titrations involve measuring the volume of a titrant of known concentration that is required to react completely with an analyte. In gravimetric titrations, the standard solution reacts with the analyte to form an insoluble precipitate, which is filtered, dried, and weighed. In coulometric titrations, current is applied to an electrochemical reaction until the reaction...
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Acid-Base Titration Curves02:23

Acid-Base Titration Curves

128.0K
A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid.
For a titration carried out for 25.00 mL of...
128.0K
Precipitation Titration: Overview01:26

Precipitation Titration: Overview

6.7K
Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
6.7K
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

938
Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
938
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

2.8K
The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
2.8K
Complexometric Titration: Overview00:39

Complexometric Titration: Overview

7.2K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Updated: Jul 9, 2025

Collecting Variable-concentration Isothermal Titration Calorimetry Datasets in Order to Determine Binding Mechanisms
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Collecting Variable-concentration Isothermal Titration Calorimetry Datasets in Order to Determine Binding Mechanisms

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Canonical titration simulations.

Amin Bakhshandeh1, Yan Levin1

  • 1Instituto de FĂ­sica, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil. levin@if.ufrgs.br.

Physical Chemistry Chemical Physics : PCCP
|November 30, 2023
PubMed
Summary
This summary is machine-generated.

We developed a new Monte Carlo simulation method for titration. This approach accurately calculates molecular protonation states and pH in canonical systems, overcoming limitations of previous grand canonical methods.

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics
  • Biophysics

Background:

  • Standard constant pH (cpH) simulations are grand canonical, linking system protonation to reservoir pH.
  • Donnan potentials create discrepancies between reservoir and isolated system pH.
  • Accurate pH determination is crucial for understanding biomolecular behavior.

Purpose of the Study:

  • To introduce a novel Monte Carlo approach for titration simulations in the canonical ensemble.
  • To overcome limitations of existing methods in determining the protonation state and pH of isolated systems.
  • To provide a more accurate method for calculating the pH of canonical systems.

Main Methods:

  • Utilizing a canonical reactive Monte Carlo algorithm to determine molecular protonation states based on the total number of protons.
  • Employing a surface insertion Widom algorithm for calculating system pH, avoiding issues with bulk insertion at higher pH.
  • Implementing Ewald summation with the Bethe potential to accurately handle long-range Coulombic forces.

Main Results:

  • The new method successfully calculates the protonation state of macromolecules as a function of internal proton count.
  • The surface insertion Widom algorithm effectively determines pH across a range of values, including intermediate and high pH.
  • Ewald summation with the Bethe potential is shown to be essential for accurate pH calculations in canonical systems.

Conclusions:

  • The presented Monte Carlo approach offers a robust alternative to grand canonical methods for titration simulations.
  • This method accurately determines the protonation state and pH of isolated systems, crucial for molecular simulations.
  • The findings highlight the importance of proper treatment of electrostatic interactions for reliable pH calculations.