How are sodium dihydrogen phosphate and sodium dihydrogen phosphate formed respectively?

sodium dihydrogen phosphate (NaH2PO3) and disodium hydrogen phosphate (Na2HPO4) belong to acid salts, but the aqueous solution of disodium hydrogen phosphate is alkaline and the aqueous solution of sodium dihydrogen phosphate is acidic.

Sodium dihydrogen phosphate is prepared by the reaction of sodium carbonate with phosphoric acid, or by the reaction of sodium dihydrogen phosphate with a certain proportion of phosphoric acid.

Disodium hydrogen phosphate is prepared by the reaction of phosphoric acid and sodium carbonate under heating conditions (easy to weathering).

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