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Instrument Calibration

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...

Enthalpy

Enthalpy

Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum of a system’s internal energy (E) and the mathematical product of its pressure (P) and volume (V):

Hess's Law

Hess's Law

There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.

Constant Pressure Calorimetry

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...

Glassware Calibration

Glassware Calibration

Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...

Calorimetry

Calorimetry

When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their surroundings. An...

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Related Experiment Video

Updated: Jun 28, 2026

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

Published on: August 17, 2016

Hydrogenation enthalpimetry--I: microcomputer-assisted calibration and data-acquisition.

D W Rogers¹, B J Siedman

¹Chemistry Department, Long Island University, Brooklyn, New York 11201, USA.

|February 1, 1987

Summary

A new calorimetric device enables automated determination of unsaturated hydrocarbons using catalytic hydrogenation. This method offers precise analysis of small samples but lacks specificity for complex mixtures.

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Area of Science:

Analytical Chemistry
Physical Chemistry
Chemical Engineering

Background:

Accurate quantification of unsaturated hydrocarbons is crucial in various industrial and research applications.
Traditional methods for determining unsaturation can be time-consuming or require specialized equipment.
Enthalpimetric analysis offers a potentially rapid and sensitive approach for chemical reaction monitoring.

Purpose of the Study:

To develop and describe a novel calorimetric device for the enthalpimetric determination of unsaturated hydrocarbons.
To evaluate the performance of the device in terms of sample weight range and analytical accuracy.
To assess the suitability of the method for routine and automated analysis.

Main Methods:

Utilized a calorimetric device to measure the enthalpy change associated with the catalytic hydrogenation of unsaturated hydrocarbons.
Employed digital electronics for precise control and data acquisition during the enthalpimetric determination.
Analyzed sample weights ranging from less than 1 mg to approximately 20 mg.

Main Results:

The calorimetric device achieved a mean error of approximately 2% for the analyzed samples.
The method demonstrated high throughput potential, being well-suited for routine and automated determination.
The primary limitation identified was the lack of specificity, making it challenging to analyze complex mixtures.

Conclusions:

The developed calorimetric device provides an effective means for the enthalpimetric determination of unsaturated hydrocarbons via catalytic hydrogenation.
The method is accurate and efficient for analyzing small sample quantities, particularly in automated workflows.
Further development may be needed to address the specificity limitations for complex sample matrices.