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The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Sodium benzoate also known as benzoate of soda is the sodium salt of benzoic acid, widely used as a food preservative (with an E number of E211) and a pickling agent. It appears as a white crystalline chemical with the formula C 6 H 5 COONa.
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For example, for three structural isomers with molecular formula C 5 H 12 the melting point increases in the series isopentane −160 °C (113 K) n-pentane −129.8 °C (143 K) and neopentane −16.4 °C (256.8 K). [15] Likewise in xylenes and also dichlorobenzenes the melting point increases in the order meta, ortho and then para.
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It is usually prepared by the dehydration reaction of benzoic acid, e.g. using acetic anhydride: [3]. 2 C 6 H 5 CO 2 H + (CH 3 CO) 2 O → (C 6 H 5 CO) 2 O + 2 CH 3 CO 2 H. Alternatively, sodium benzoate can be treated with benzoyl chloride.