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Related Concept Videos

Solution Concentration and Dilution02:59

Solution Concentration and Dilution

The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
Expressing Solution Concentration02:48

Expressing Solution Concentration

A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
Concentrations may be quantitatively assessed using a wide variety of measurement units, each convenient for particular applications. Molarity (M) is a useful concentration unit for many applications in chemistry.
Steady State Concentration01:05

Steady State Concentration

A steady state refers to the level of a drug in the body once it has reached an equilibrium between administration and elimination. It represents the point at which the drug administration rate equals the drug elimination rate, resulting in a relatively constant concentration in the body over time. The dynamic equilibrium is crucial to ensure the drug's effectiveness with minimal risk of toxicity.
Most drugs are administered in repeated doses at fixed intervals or through continuous intravenous...
Concentration and Rate Law03:03

Concentration and Rate Law

The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:
Le Chatelier's Principle: Changing Concentration02:27

Le Chatelier's Principle: Changing Concentration

A system at equilibrium is in a state of dynamic balance, with forward and reverse reactions taking place at equal rates. If an equilibrium system is subjected to a change in conditions that affects these reaction rates differently (a stress), then the rates are no longer equal and the system is not at equilibrium. The system will subsequently experience a net reaction in the direction of a greater rate (a shift) that will re-establish the equilibrium. This phenomenon is summarized by Le...
The Integrated Rate Law: The Dependence of Concentration on Time02:39

The Integrated Rate Law: The Dependence of Concentration on Time

While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...

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Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
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Concentration and content.

Xavier Fuentes-Arderiu

    Biochemia Medica
    |July 31, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study clarifies the metrological definitions of biological concentration and content, crucial for accurate measurements in health sciences. It aims to reduce confusion by defining these terms based on international standards for nomenclature and terminology.

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    Area of Science:

    • Biomedical Science
    • Metrology
    • Clinical Laboratory Science

    Background:

    • Accurate measurement of biological quantities is fundamental in health sciences.
    • Ambiguity in the terms 'concentration' and 'content' is frequently observed in biomedical literature.
    • Classical definitions distinguish concentration by volume and content by mass, but further clarification is needed.

    Discussion:

    • The article addresses the metrological meaning of 'concentration' (amount per volume) and 'content' (amount per mass).
    • It highlights that these terms can remain ambiguous due to variations in the type of amount (analyte) and system (liquid, gas, solid).
    • The discussion emphasizes the need for precise definitions to avoid misinterpretation in scientific communication.

    Key Insights:

    • Provides a clear distinction between concentration and content based on the denominator (volume vs. mass).
    • Explains how different types of amounts and systems lead to various specific concentration and content measures.
    • Offers a framework for understanding these metrological concepts in biological and chemical contexts.

    Outlook:

    • Promotes the adoption of standardized nomenclature and terminology in metrology, chemistry, and clinical laboratory sciences.
    • Aims to enhance the clarity and accuracy of scientific reporting and inter-laboratory comparisons.
    • Facilitates better understanding and application of biological quantity measurements in research and practice.