Ammonia weak base encounter

Thus far we have focused our attention on acids. Very few common weak bases are soluble in water. Aqueous ammonia is the most frequendy encountered example. From our earlier discussion of bonding in covalent compounds (Section 8-8), we recall that there is one unshared pair of electrons on the nitrogen atom in NHj. When ammonia dissolves in water, it accepts H+ from a water molecule in a reversible reaction (Section 10-4). We say that NH3 ionizes slightly when it undergoes this reaction. Aqueous solutions of NH3 are basic because OH ions are produced. 

Water is the solvent, so it is omitted from the equilibrium-constant expression. The most commonly encountered weak base is ammonia ... 

The most commonly encountered weak base is ammonia. 

Ammonia (NH3) is the weak base most often encountered in addition to the anions of strong acids. The dissociation reaction of gaseous NH3 in water, given earlier in Example 9.1, is... 

Polyacrylamides are chemically stable towards acids (TFA, hydrogen fluoride [163]), bases, and weak oxidants or reducing agents. Problems, which might be related to cleavage of the amide bonds in poly(7V,/V-dialkylacrylamidcs), were encountered upon treatment of such supports with sodium in liquid ammonia [169]. 

Cationic gold(i) species [Au(L)] can be stabilised by coordination of a solvent molecule. However, in order to secure the catalytic activity of the newly formed species, the solvent has to be weakly coordinated and able to be easily replaced by unsaturated substrates. There are examples of gold solvate species with, for example toluene, THF, pyridine and ammonia Nevertheless, the most common gold solvate complexes encountered in the literature are based on coordination to acetonitrile [Au(L)(MeCN)][X] (L = PR3 or NHC, X = BF4, SbFe, PFe, Such species can be easily... 

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