Chemical formula: Na2H2PO4.2H2O
Synonyms: sodium dihydrogenphosphate.
Amount: 150 g
Appearance and odour: white crystalline powder, without appreciable odour
Grade: 99 %
Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labeled. Bottle and cap are UN approved and reusable.
Description and uses: sodium dihydrogenphosphate dihydrate is a water soluble orthophosphate compound and an excellent source of phosphate ions.
This salt is also a weak diprotic acid (H2PO4 -) and thus suitable to make rugged buffers. Neutralise it further with sodium hydroxide to obtain buffer solutions over a wide range of slightly acidic or even alkaline pHs.
By careful neutralisation with NH3, sodium ammonium hydrogenphosphate (NH4NaHPO4), aka 'cosmic salt', is obtained. Gentle heating transforms this into NaPO3, sodium metaphosphate.
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