Any one having related articles to find the order of these reactions
2 H3PO4+ Na2CO3→2 NaH2PO4 +CO2+H2O
2 NaH2PO4+ Na2CO3→ 2Na2HPO4+CO2+H2O
NaH2PO4+ 2Na2HPO4→Na5P3O10+2H2O
The first two reactions are very fast acid-base equilibria. The kinetics depends on how do you mix the reagents.I have never heard about the third reaction. A mixing of NaH2PO4 and Na2HPO4 is a standard preparation of phosphate buffer solutions.
You have to analyse the partial reactions reduced to the elementary steps (keyword: reaction rate for every reactant, Sum of the exponents = order).
You will find the steps for the first one by searching the solubility of CO2 and the dissociation of the H3PO4.
The last one will not take place in solution. I guess you mean in solid state (meta- to ortho-phosporic acid). Nevertheless the presented reaction is not an elementary step of the first condensation
2 NaxHyPO4 NaxH2y-2P2O7 [or Nax(Hy-1PO3O1/2)2] + H2O.
This is similar to a condensation of silanes.
Article Analysis of silanes and of siloxanes formation by Raman spectroscopy
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