Amphiprotic species

Amphiprotic Species Some species can behave as either an acid or a base. For example, the following two reactions show the chemical reactivity of the bicarbonate ion, HC03, in water. 

A species that can serve as both a proton donor and a proton acceptor is called amphiprotic. Whether an amphiprotic species behaves as an acid or as a base depends on the equilibrium constants for the two competing reactions. For bicarbonate, the acid dissociation constant for reaction 6.8... 

Amphiprotic species Capable of acting as either a Brensted-Lowry acid or base, 354,372-373,623... 

Notice that HC03 is the amphiprotic species, acting as both an acid and as a base. 

Amphiprotic species A compound that can both donate and accept protons. 

Amphiprotic species -> A molecule or ion that can act as either a Bronsted acid donor)... 

Separation of Amphiprotic Species In isoelectric. separation of amphiprotic species, the separation is performed in a buffer mixture that continuously varic.s in pH along its length. This pH gradient is prepared from a mixture of several different ampholytes in an aqueous solution. Ampholytes arc amphoteric compounds usually containing carboxylic and amino groups. Ampholyte mixtures having different pH ranges can be prepared or arc available from several commercial sources. 

Amphiprotic species Many substances can both donate and accept protons examples are H2PO4, HCO3, NH3, and H2O. Such substances are said to be amphiprotic the dissolved species themselves are called ampholytes. 

Based on the Bronsted-Lowry definition of acids and bases, an acid is a proton donor and base is a proton acceptor. A species (charged or uncharged) that can gain or lose a proton is called amphoteric or amphiprotic species. For example, (bicarbonate ion) HCOj" can donate a proton acting as an acid. The same species can accept a proton acting as a base. Hence, amphoteric species can act as an acid or a base depending on the surrounding conditions. 

SOLUTION We know that the pH of the pure intermediate (amphiprotic) species, H2A, is... 

What is an amphiprotic species Name one and write balanced equations that show why it is amphiprotic. 

The Br0nsted—Lowry concept defines a species as an acid or a base according to its function in the acid—base, or proton-transfer, reaction. As you saw in Example 16.1, some species can act as either an add or a base. An amphiprotic species is a species that can act as either an acid or a base (it can lose or gain a proton), depending on the other reactant. For example, HC03 acts as an acid in the presence of OH but as a base in the presence of HF. Anions with ionizable hydrogens, such as HC03, and certain solvents, such as water, are amphiprotic. 

Amphiprotic species a species that can act as either an acid or a base (that is, it can lose or gain a proton). (16.2)... 

An amphiprotic species is a molecule or ion that can both accept and donate protons. For instance, HCOj can act as an acid (to form COf") and as a base (to form H2CO3). Among the most important amphiprotic compounds are the amino acids, which can act as proton donors by virtue of their carboxyl groups and as bases by virtue of their amino groups. 

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