What is the E number for/of Sodium Carbonate?

Tabby Tom

E-500. The number also covers sodium hydrogen carbonate and sodium sesquicarbonate (Pears Factfinder 2002) Oct 17 02, 6:30 PM

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I have a container which originally held 500 grams of what the label claims to be "finest table salt" - pretty much pure sodium chloride. Yet, out of every 100 grams in the container, only 39 grams are sodium. Since a molecule of table salt is made up of an equal number of sodium and chlorine atoms, this leads me to believe that chlorine is a much heavier element than sodium. Is that really true? If Vic Oliver was number one and A.E. Matthews number 100, who were 500 and 1000? What is another name for Potassium Carbonate? What is the nickname for sodium pentathol?

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