Orthophosphoric acid. See

Bis (2-ethylhexyl) orthophosphoric acid. See Di (2-ethylhexyl) phosphate Bis (2-ethylhexyloxycarbonylmethylthio) dibutylstannane. See Dibutyltin bis(2-ethylhexyl mercaptoacetate)... 

Methyl orthophosphoric acid. See Methyl acid phosphate... 

Methyl orthophosphoric acid. See Methyl acid phosphate Methyloxacyclopropane Methyloxirane S(>)>Methyloxirane. See Propylene oxide... 

Dental silicate cement liquids are concentrated aqueous solutions of orthophosphoric acid generally containing aluminium and zinc (Wilson, Kent Batchelor, 1968 Kent, Lewis Wilson, 1971a,b Wilson et al., 1972). The optimum orthophosphoric acid concentration is 48 to 55 % by mass (Wilson et al, 1970a), although higher concentrations are encountered. Aluminium is present as phosphate complexes and zinc as a simple ion (see Section 6.1.2). Examples are given in Table 6.6. 

The oxide most commonly formed by the combustion of elemental white phosphorus and many phosphorus compounds is P4O10. As an item of commerce, this compound is usually misnamed phosphorus pentoxide. When produced from the combustion of elemental phosphorus (see Reaction 10.6.7), it is a fluffy white powder that removes water from air to form syrupy orthophosphoric acid ... 

In the calculations on these systems (see Hoffmann and Ladik (1964) and Fraga and Valdemoro (1967)), the existence of the orthophosphoric acid and the sugar is not taken into account. That is, the treatments have been directed towards an investigation of the changes due to the possible Tt-bonding, if any, between the stacked bases. 

Table 30 collects the effective -charges on the principal heteroatoms of the individual bases for the same mono-, di-, and trinucleotides of Table 29. These tables (see p. 37) provide the numerical evidence for the comments made above. The electron distributions in the individual bases are almost constant, independent of whether they participate in a polynucleotide or not. Of course, this is a conclusion valid only within the framework of the approximations in these treatments, including the omision of the orthophosphoric acid and the sugar and the neglect of overlap.

The numerous oxyacids of phosphorus may be regarded as derived from three prototypes, namely, hypophosphorous acid, H3P02, phosphorous acid, H3P03, and orthophosphoric acid, HsP04, in all of which phosphorus probably has the co-ordination number 4 (see p. 59). 

There are many oxoacids containing phosphorus. Some examples are phosphorous acid, H3PO3 phosphoric acid, H3PO4 hypophosphorous acid, H3PO2 and triphosphoric acid, H5P3O10 (Figure 21.11). Phosphoric acid, also called orthophosphoric acid, is a weak triprotic acid (see p. 619). It is prepared industrially by the reaction of calcium phosphate with sulfuric acid ... 

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