Comparing E210 - Benzoic acid vs E639 - DL-alanine

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.