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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Based on this information, it is clear that the terms “Acid”, “Base”, “conjugate acid”, and “conjugate base” are not fixed for a certain lowgy species; but are interchangeable according to the reaction taking place.

C 2 H 5 NH 2 Ethylamine. This functions as such:. In an acid-base reactionan acid plus a base reacts to form a conjugate base plus a conjugate acid:. H 2 O Water neutral, pH 7.

Similarly, base strength decreases and conjugate acid strength increases down the table. The simplest anion which can be a conjugate base is the solvated electron whose conjugate acid is the atomic hydrogen. If a conjugate base is classified as strong, it will “hold on” to the hydrogen proton when in solution and its acid will not dissociate. In contrast, here is a table of bases and their conjugate acids.

Conjugate acid

C 6 H 6 CO 2 Benzoic acid. H 2 SO 4 Sulfuric acid. Hence, a conjugate base is a species formed by the removal of bronsetd proton from an acid.

C 5 H 5 N Pyridine. 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.


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On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. When finding a conjugate acid or base, it is important to look at the reactants of the chemical equation. Baaa to the following figure:.

H 2 CO 3 Carbonic acid.

Conjugate acid – Wikipedia

By using this site, you agree to the Terms of Use and Privacy Policy. From Wikipedia, the free encyclopedia. Retrieved from ” https: Lactic acid has the formula C 3 H 6 O 6 and its conjugate base is used in intravenous fluids that consist of bronste and potassium cations along with lactate and chloride anions in solution with distilled water. The most important buffer in our bloodstream is the carbonic acid-bicarbonate bufferwhich prevents drastic pH changes when CO 2 is lpwry.

To identify the conjugate acid, look for the pair of compounds that are related. Similarly, if an acid is weak, its conjugate base will be strong.

Conjugates are formed when an acid loses a hydrogen proton or a base gains a hydrogen proton. In this case, the reactants are the acids bronwted bases, and the acid corresponds to the conjugate base on the product side of the chemical equation; as does the base to the bronstee acid on the product side of the equation.


The conjugate base in the after side of the 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. H 2 S Hydrosulfuric acid. Therefore, weak acids will have weak conjugate bases, unlike the misconception that they have strong conjugate bases. If a conjugate acid is strong, its dissociation will have a higher equilibrium constant and the products of the reaction will be favored. In a buffer, a weak acid and its conjugate base in the form of a saltor a weak base and its conjugate acid, are used in order to limit the pH change during a titration process.

H 3 PO 4 Phosphoric acid. The strength of a conjugate base can be seen as the tendency of the species to “pull” hydrogen protons towards itself. A second common application with an organic compound would be the production of a buffer with acetic acid.

The strength of a conjugate acid is directly proportional to its dissociation constant. Aswm acid—base reaction can be viewed in a before and after sense.