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Acids, Bases and Neutralization Reactions

Acids, Bases and Neutralization Reactions

Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...

Acids, Bases and Neutralization Reactions

Acids, Bases and Neutralization Reactions

An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.

Composition of Polyprotic Acid Solutions as a Function of pH

Composition of Polyprotic Acid Solutions as a Function of pH

Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
A graph with the alpha values is plotted against the volume of base added during titration. Here, a...

Polyprotic Acids

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:

Brønsted-Lowry Acids and Bases

Brønsted-Lowry Acids and Bases

In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these reactions, which is...

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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Determination of the Gas-phase Acidities of Oligopeptides

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Published on: June 24, 2013

Basics of compounding with acids.

¹International Journal of Pharmaceutical Compounding, Edmond, OK.

International Journal of Pharmaceutical Compounding

|August 9, 2013

Summary

This summary is machine-generated.

Compounding pharmacies face confusion regarding acid concentrations and labeling. This article clarifies procedures for using concentrated weight/weight (w/w) and dilute weight/volume (w/v) acids in compounding.

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Area of Science:

Pharmaceutical compounding
Chemical measurement standards

Background:

Recent years have seen increased confusion in pharmaceutical compounding practices involving acids.
Lack of clarity in procedures and labeling for acid compounding has been identified as a key issue.

Purpose of the Study:

To clarify confusing areas in acid compounding procedures.
To provide a clear, implementable procedure for compounding pharmacies.

Main Methods:

The study addresses the discrepancy between concentrated acids (weight/weight, w/w) and dilute acids (weight/volume, w/v).
Focuses on practical application within compounding pharmacy settings.

Main Results:

Provides a framework to resolve confusion surrounding acid concentrations in compounding.
Offers standardized procedures for accurate w/w and w/v acid usage.

Conclusions:

Implementation of clear procedures will enhance accuracy and safety in acid compounding.
Standardized protocols will reduce errors and improve efficiency in compounding pharmacies.