Any reaction using Na2HPO4

Na2HPO4 is more commonly known as disodium phosphate or disodium hydrogen phosphate.

Well, wikipedia has a whole article on it:

Disodium phosphate - Wikipedia, the free encyclopedia

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It is therefore used commercially as an anti-caking additive in powdered products.

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Disodium phosphate can be used in cream of wheat to quicken cook time, as described on the ingredients panel of the product package.

Disodium phosphate is used in conjunction with trisodium phosphate in many steam boiler applications. It supplies the inventory of free phosphates to retard calcium scale formation.

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