Comparing E339 - Sodium phosphates vs E451I - Pentasodium triphosphate
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Popular questions
How are sodium phosphates made?
They’re produced by neutralizing food‑grade phosphoric acid with sodium hydroxide, carbonate, or bicarbonate to the desired ratio to yield mono-, di-, or trisodium phosphate, then crystallizing (often as hydrates); condensed polyphosphates are made by dehydrating/condensing orthophosphates at elevated temperatures.
How do saline enema sodium phosphates work?
They act as hyperosmotic salts that draw water into the colon, increasing volume and stimulating peristalsis to trigger a bowel movement; improper use can cause fluid and electrolyte imbalances, so they should be used only as directed.
How does sodium aluminate react with phosphates?
In water, sodium aluminate hydrolyzes to Al(OH)3, which binds phosphate and precipitates it as insoluble aluminum phosphate (AlPO4), especially near neutral pH—this is the basis for phosphate removal in water treatment.
How many meq of sodium does sodium phosphates have?
It depends on the specific salt and hydration: anhydrous NaH2PO4 ≈8.3 mEq Na per gram, Na2HPO4 ≈14.1 mEq/g, and Na3PO4 ≈18.3 mEq/g (hydrates contain less per gram); a typical adult sodium phosphate enema contains about 190 mEq of sodium.
How many sodium phosphates are there?
There are three main orthophosphate salts used in foods—monosodium, disodium, and trisodium phosphate—listed as E339(i–iii), plus various hydrates and condensed (polyphosphate) forms.
How many formula units of magnesium phosphate will be produced from 35.8 g of sodium triphosphate?
You can’t determine that from 35.8 g of pentasodium triphosphate alone—you need a balanced reaction and the amount of Mg2+ present, and in practice STPP mainly chelates magnesium rather than precipitating Mg3(PO4)2 unless it hydrolyzes to orthophosphate under specific conditions.
How much sodium triphosphate in dish soap?
Most household dishwashing liquids (and many automatic dishwasher detergents) now contain 0% phosphate due to regulations; some industrial/ institutional formulations can still include up to several–tens of percent STPP—check the product label or safety data sheet.
What chemistry experiment to do with sodium triphosphate?
Demonstrate water softening by comparing soap lather or measuring water hardness (EDTA titration) before and after adding a small, known amount of STPP to hard water.
What is pentasodium triphosphate toothpaste?
A toothpaste that includes pentasodium triphosphate (STPP) as a tartar‑control/whitening agent, binding calcium to reduce calculus and help lift surface stains; it’s used at low, safe levels for oral care.
What is pentasodium triphosphate used for?
As a food additive (E451i) it acts as a sequestrant, emulsifier and stabiliser to retain moisture and improve texture in processed meats/seafood and to control metal ions; outside food it’s widely used as a detergent builder and water softener, with an EFSA group ADI for phosphates of 40 mg/kg bw/day (as phosphorus).