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Acid–Base Titration: Overview

Acid–Base Titration: Overview

An acid-base titration is a technique used to determine the concentration of an unknown acid or base, using a titrant of known concentration–either a base for acid titration or an acid for base titration. The process involves gradually adding the titrant, leading to a predictable change in the pH of the solution. This change is plotted on a titration curve, showing how a solution's pH varies with the amount of titrant added. Such curves are instrumental in monitoring the titration's progress...

Controlled-Current Coulometry: Coulometric Titration

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...

Conductometric Titrations: Strong Acid-Base and Weak Acid-Base Titrations

Conductometric Titrations: Strong Acid-Base and Weak Acid-Base Titrations

In acid-base titrations, conductance measurements are utilized to detect the endpoint. This method is grounded on the fact that electrical conductance relies on the number and mobility of ions. For instance, consider titrating strong acid HCl with a strong NaOH base. Initially, the HCl in the conductivity vessel conducts electricity due to the presence of hydrogen ions and chloride ions. As NaOH is gradually added from the burette, the fast-moving hydrogen ions are replaced by slower-moving...

Acid-Base Titration Curves

Acid-Base Titration Curves

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 0.100...

Titration of a Weak Acid with a Strong Base

Titration of a Weak Acid with a Strong Base

In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...

Solution Composition During Acid/Base Titrations

Solution Composition During Acid/Base Titrations

The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values represent the...

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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NO_x

Published on: December 20, 2016

A fully automatic system for acid-base coulometric titrations.

A Cladera¹, A Caro, J M Estela

¹Department of Analytical Chemistry Faculty of Sciences University of the Balearic Islands Palma de Mallorca 07071 Spain.

The Journal of Automatic Chemistry

|January 1, 1990

Summary

This summary is machine-generated.

An automated titration system using electrogenerated ions and potentiometric detection offers accurate, hands-free analysis for environmental and nutritional samples. This innovation enables sequential testing of multiple samples with minimal error.

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Area of Science:

Analytical Chemistry
Electrochemistry
Automation

Background:

Traditional acid-base titrations can be labor-intensive and prone to human error.
Automated systems are needed for high-throughput analysis and improved reproducibility.

Purpose of the Study:

To develop an automatic system for acid-base titrations using electrogenerated ions.
To enable potentiometric end-point detection for enhanced accuracy.
To assess the system's performance on diverse sample types.

Main Methods:

Development of a PC-controlled system for instrumental operation, data acquisition, and processing.
Electrogeneration of hydrogen (H+) and hydroxide (OH-) ions for titration.
Potentiometric detection for precise end-point determination.
Sequential analysis of up to 13 samples without manual intervention.

Main Results:

The automated system demonstrated low errors and relative standard deviations (RSD) when titrating standard solutions.
Successful application to the analysis of environmental samples (waters) and nutritional samples (soft drinks, wines).

Conclusions:

The developed automatic titration system provides a reliable and efficient method for acid-base analysis.
The system is suitable for sequential analysis of multiple samples, reducing hands-on time and improving accuracy.
Its applicability to environmental and nutritional matrices highlights its practical value.