Comparing E210 - Benzoic acid vs E470AI - Sodium salts of fatty acids
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Popular questions
Is benzoic acid soluble in water?
Only sparingly—about 3 g per liter at room temperature; its solubility increases in hot water and it dissolves readily in many organic solvents.
Is benzoic acid polar?
It has a polar carboxyl group but a nonpolar aromatic ring, so overall it’s only weakly polar; its benzoate salt is much more polar and water‑soluble.
Is benzoic acid a strong acid?
No—it's a weak acid, with a pKa of about 4.2.
What is the melting point of benzoic acid?
About 122–123 °C (251–253 °F).
Is benzoic acid bad for you?
At approved food levels it’s considered safe, with an ADI of 0–5 mg/kg body weight/day; some people may experience irritation or hypersensitivity, and benzene formation in certain acidic drinks is monitored and kept very low.
Explain why sodium salts of fatty acids, although they are salts, are not very soluble in water?
Their long hydrophobic hydrocarbon tails outweigh the small ionic (carboxylate) head, so they prefer to aggregate into micelles or lamellar phases rather than disperse as individual ions; solubility decreases with chain length and is generally lower for sodium than potassium salts.
What are sodium or potassium salts of fatty acids?
They are soaps—anionic surfactants (RCOO− Na+ or RCOO− K+) formed by neutralizing fatty acids with sodium or potassium hydroxide, used in foods as emulsifiers and stabilizers.
What are sodium salts of long chain fatty acids called?
They are commonly called soaps, for example sodium stearate or sodium palmitate.
What do the sodium salts of fatty acids taste like?
They have a characteristic soapy, slightly bitter/alkaline taste; at typical food-use levels they contribute little flavor but can cause a soapy off-note if overused.
What is special about sodium salts of fatty acids?
They are amphiphilic surfactants that lower surface tension and self-assemble (e.g., into micelles), enabling them to emulsify and stabilize fat–water mixtures. They can also form insoluble “soaps” with calcium or magnesium ions.