Comparing E536 - Potassium ferrocyanide vs E539 - sodium thiosulfate
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Popular questions
How to make potassium ferrocyanide?
It’s produced industrially from iron salts and cyanide chemistry under tightly controlled conditions; do not attempt to synthesize it yourself, and only food‑grade E536 from reputable suppliers is suitable for food use.
How could one ingest potassium ferrocyanide?
You don’t ingest it directly; when permitted, it’s present only in trace amounts as an anticaking agent in table salt (e.g., EU max 20 mg/kg salt), and normal dietary exposure via salt is considered safe.
How many grams of potassium ferrocyanide must be used to prepare 800.0ml of 6.00m solution?
A 6.00 M aqueous solution is not practically achievable due to solubility limits; in theory it would require about 2.03 kg of K4[Fe(CN)6]·3H2O for 0.800 L, which far exceeds what will dissolve.
How to dry potassium ferrocyanide?
Do not heat it to “dry” it—E536 is typically used as the trihydrate, and heating can decompose it and release toxic gases; for food use, simply store the sealed container in a dry place.
How to make .5m potassium ferrocyanide?
Using the common trihydrate, 0.5 M corresponds to about 211 g per liter of solution; this is a laboratory preparation and not a food‑use practice, so it should only be done with appropriate lab controls and PPE.
What is sodium thiosulfate used for?
As a food additive (E539), it functions as an antioxidant and sequestrant, binding trace metals and helping prevent oxidation; it’s also used to neutralize residual chlorine in processing water.
How much sodium thiosulfate to neutralize chlorine?
About 7 parts of sodium thiosulfate pentahydrate (Na2S2O3·5H2O) are needed per 1 part of chlorine (as Cl2) by weight—for example, ~7 mg/L thiosulfate per 1 mg/L free chlorine; in practice, a small excess is often used.
Is gold sodium thiosulfate in makeup?
Gold sodium thiosulfate is a different compound from food additive E539 and isn’t typically used in cosmetics; check the ingredient list if you’re concerned about gold-containing ingredients.
How many elements are in sodium thiosulfate?
Anhydrous sodium thiosulfate (Na2S2O3) contains 3 elements (Na, S, O); the common pentahydrate (Na2S2O3·5H2O) includes 4 (adds H from the water of crystallization).
What does sodium thiosulfate do?
In foods it acts as an antioxidant and sequestrant, helping prevent oxidation and off-colors by binding metals, and it can dechlorinate processing water.