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Tetrasodium pyrophosphate
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<p>Tetrasodium pyrophosphate, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> Na4P2O7. As a salt, it is a white, water-soluble solid. It is composed of <a href="/facts/Pyrophosphate/L9FPEkhF">pyrophosphate</a> anion and <a href="/facts/Sodium/eYuSPu2V">sodium</a> <a href="/facts/Ion/wrbwhF3z">ions</a>. Toxicity is approximately twice that of <a href="/facts/Table_salt/SCplalQ3">table salt</a> when ingested orally. Also known is the decahydrate Na4P2O7 · 10(H2O). </p>