Bransted base

It follows that sodium hydroxide, because it supplies OH- ions, which accept protons, is a Bransted base. Ammonia is a base because, as we see from Eq. 1, it accepts protons from water and forms NH4+ ions. 

It is important to note that (i) all Arrhenius acids are Bransted adds but all Arrhenius bases are not Bransted bases, and (ii) Brans-ted-lower concept is not limited to molecules to act as acids and bases but ionic spedes may also be considered as adds or bases. 

Strategy What are the characteristics of a Bransted acid Does it contain at least an H atom With the exception of ammonia, most Bransted bases that you will encounter at this stage are anions. 

A water molecule acting as a Bransted base accepts a proton from the tert-butyioxonium ion. 

Strictly speaking, these metal hydroxides are not Bransted bases because they cannot accept a proton. However, the hydroxide ion (OH ) formed when they ionize is a Bronsted base because it can accept a proton ... 

The existence of the sites acting as a Bransted base was also demonstrated by observing dissociation of an H from certain molecules.On adsorption of benzalde-hyde, 2-propanol, and chloroform on CaO, the IR OH stretching band is intensified. The dissociation of these molecules is schematically drawn as follows. 

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