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valency angle' for sodium pyrophosphate is 127 °.Of the three bond lengths in the -PO 3 group, P-O(3) = 1.512/~ is slightly the shortest.This seems to correlate with the involvement of 0(3) in the smallest O-P-O(1) angle, since a similar effect occurs in the above three sulphates.One of us (W.S.M.) thanks the
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McDonald et al. (1967) studied this question.
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