For example, phosphoric acid, H 3 PO 4, has sometimes been called " orthophosphoric acid ", in order to distinguish it from metaphosphoric acid, HPO 3.
12.
Three orthophosphoric acid molecules can condense in a row to obtain "'tripolyphosphoric acid "'( H 5 P 3 O 10 ), which is also shown in the illustration.
13.
Because orthophosphoric acid can undergo as many as three dissociations or ionizations ( losses of H + ions ), it has three acid dissociation constants called K a1, K a2, and K a3.
14.
He worked out methods to determine the relative amounts of leucine and tyrosine, which are produced during the degradation of several substances of this class, and was the first ( 1860 ) to understand the nature of glycide and to suggest that this substance is related to glycerol in the same way as is metaphosphoric acid to orthophosphoric acid.
15.
Because the triprotic dissociation of orthophosphoric acid, the fact that its conjugate bases ( the phosphates mentioned above ) cover a wide pH range, and, because phosphoric acid / phosphate solutions are, in general, non-toxic, mixtures of these types of phosphates are often used as buffering agents or to make buffer solutions, where the desired pH depends on the proportions of the phosphates in the mixtures.
16.
For each of the dissociation reactions shown above, there is a separate acid dissociation constant, called " K " a1, " K " a2, and " K " a3 given at 25 �C . Associated with these three dissociation constants are corresponding p " K " a1 = 2.12, p " K " a2 = 7.21, and p " K " a3 = 12.67 values at 25 �C . Even though all three hydrogen ( H ) atoms are equivalent on an orthophosphoric acid molecule, the successive " K " a values differ since it is energetically less favorable to lose another H + if one ( or more ) has already been lost and the molecule / ion is more negatively charged.
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