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Depends on the context. Technically, phosphorus is an element (P), and phosphate is a molecular anion (PO4_3-), part of phosphoric acid (H3PO4). In (medical) diagnostic testing, they're often used interchangeably, sometimes called "inorganic phosphorus." It's also an essential plant nutrient, so on fertilizers you'll see the phosphorus content expressed as a percentage (by weight) measured as P2O5, the anhydride of phosphoric acid.

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15y ago
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14y ago

No. Trisodium phosphate is Na3PO4, but tripotassium phosphate is K3PO4. Potassium (K+) is not the same thing as sodium (Na+), even though both are attached to a phosphate (PO43-) in thisexample.

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9y ago

Phosphorus is an element. Phosphate is an ion. The latter is composed from two different elements--phosphorus and oxygen.

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Q: Is trisodium phosphate the same as tripotassium phosphate?
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