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Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
Graphs of Polar Equations01:17

Graphs of Polar Equations

The polar coordinate system represents points using a distance from a central point (the pole) and an angle from a reference direction (the polar axis). Unlike rectangular coordinates, polar coordinates are ideal for graphing curves with radial symmetry or periodic behavior.Some general forms of graphs in polar coordinates include the following:Equation of a Circle (Centered at the Pole):A graph where the radius remains constant for all angles traces a circle centered at the pole:Equation of a...
Calculating the Equilibrium Constant02:46

Calculating the Equilibrium Constant

The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression.
For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation:
Pole and System Stability01:24

Pole and System Stability

The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Calculating Equilibrium Concentrations02:05

Calculating Equilibrium Concentrations

Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
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Related Experiment Video

Updated: Jun 28, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

POLAG-a general computer program to calculate stability constants from polarographic data.

D J Leggett1

  • 1Department of Chemistry, University of Houston, Houston, Texas 77004, U.S.A.

Talanta
|October 1, 1980
PubMed
Summary
This summary is machine-generated.

A new computer program, POLAG, calculates chemical stability constants from polarographic data without needing data pretreatment. It fits various equilibrium models to experimental results, demonstrating broad applicability.

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Area of Science:

  • Analytical Chemistry
  • Computational Chemistry

Background:

  • Polarography is a key electrochemical technique for studying metal complexation.
  • Accurate determination of stability constants is crucial for understanding chemical equilibria.
  • Existing methods for stability constant calculation can be complex and require data preprocessing.

Purpose of the Study:

  • To develop a versatile computer program, POLAG, for calculating stability constants from polarographic data.
  • To eliminate the need for experimental data pretreatment in stability constant calculations.
  • To accommodate diverse chemical equilibrium models in the analysis.

Main Methods:

  • Development of a general computer program named POLAG.
  • Input of raw polarographic data directly into the program.
  • Fitting of various equilibrium models with the general formula M(m)H(j)(OH)(k)L(n)L'(p) to the data.

Main Results:

  • POLAG successfully calculates stability constants from polarographic data.
  • The program requires no pretreatment of experimental data.
  • POLAG demonstrated versatility by reprocessing data from four independent research groups.
  • The program can fit complex equilibrium models to the data.

Conclusions:

  • POLAG offers a user-friendly and efficient method for determining stability constants.
  • The program's ability to handle diverse models and raw data enhances its utility in chemical research.
  • POLAG represents a significant advancement in the computational analysis of polarographic data.