A conjugate acid, within the Brønsted–Lowry acid–base theory, is a species formed by the reception of a proton (H) by a base—in other words, it is a base with a.

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Conjugates are formed when an acid loses a hydrogen proton or a base gains a hydrogen proton. C 6 H 5 NH 2 Aniline. H 2 S Hydrosulfuric acid. Similarly, base strength decreases and conjugate acid strength increases down the table. Buffers have both organic and non-organic chemical applications. A cation can be a conjugate acid, and an anion can be a conjugate base, depending on which substance is involved and which acid—base theory is the viewpoint. The conjugate acid in the after side of an equation gains a hydrogen ion, so in the before side of the equation the compound that has one less hydrogen ion of the conjugate acid is the base.

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In a buffer, a weak acid and its conjugate base in the form loary a saltor a weak base and its conjugate acid, are used in order to limit the pH change hasa a titration process. Based on this information, it is clear that the terms “Acid”, “Base”, “conjugate acid”, and “conjugate base” are not fixed for a certain chemical species; but are interchangeable according to the reaction taking place.

H 3 PO 4 Phosphoric acid. To identify the conjugate acid, look for the pair of compounds that are related. The simplest anion which can be a conjugate base is the solvated electron whose conjugate acid is the atomic hydrogen. Bronstted contrast, here is a table of bases and their conjugate acids.


These fluids are commonly isotonic in relation to human blood and are commonly used for spiking up the fluid level in a system after severe blood loss due to trauma, surgery, or burn injury. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule.

This functions as such:. Retrieved from ” https: In an acid-base reactionan acid plus a base reacts to form a conjugate base plus a conjugate acid:.

This page was last edited on 30 Julyat Hence, a conjugate base is a species formed by the removal of a proton from an acid. A second common application with an organic compound would be the production of a buffer with acetic acid.

If a conjugate acid is strong, its dissociation will have a higher equilibrium constant and the products of the reaction will be favored. CH 3 NH bronstd Methylamine. Refer to the following figure:. H 2 CO 3 Carbonic acid.

The strength of a conjugate acid is directly proportional to its dissociation constant. Bsa before is the reactant side of the equation, the after is the product side of the equation. Baea acid and conjugate base as well as the base and conjugate acid are known as conjugate pairs. Acetic acid, along with many other weak acids, serve as useful components of buffers in different lab settings, each useful within their own pH range.


The acid—base reaction can be viewed in a before and after sense. C 6 H 6 CO 2 Benzoic acid.

Conjugate acid – Wikipedia

Lactic acid has the formula C 3 H 6 O 6 and its conjugate base is used in intravenous fluids that consist of sodium and potassium cations along with lactate and chloride anions in solution with distilled water.

The conjugate base in the after side of bwsa equation lost a hydrogen ion, so in the before side of the equation, the compound that has one more hydrogen ion of the conjugate base is the acid.

On the other hand, if a species is classified as a strong acid, its conjugate base will be weak in nature.

Therefore, weak acids will have weak conjugate bases, unlike the misconception that they aam strong conjugate bases. H 2 O Water neutral, pH 7. C 2 H 5 NH 2 Ethylamine. Similarly, if an acid is weak, bwsa conjugate base will be strong. When finding a conjugate acid or base, it is important to look at the reactants of the chemical equation.

One use of conjugate acids and bases lies in buffering systems, which include a buffer solution. H 2 SO 4 Sulfuric acid. On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction.