Is sodium hexametaphosphate acidic or alkaline

The so-called "weak acid" in strong alkali weak salts refers to phosphoric acid, but this is not sodium phosphate, but sodium hexametaphosphate, hexametaphosphate is the condensation acid of phosphorus, it is not weak acid.            Sodium hexametaphosphate is usually obtained by dehydration and condensation of sodium dihydrogen phosphate. The saturated solution PH of sodium dihydrogen phosphate is 4.4.6, which has obvious acidity, and the acidity will be stronger after condensation.

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