Acidity/alkalinity pH = 3.5–5.0 for a 5% w/v aqueous solution at 208C. <br>Melting point Sodium metabisulfite melts with decomposition at less than 1508C. <br>NIR spectra see Figure 1.Osmolarity A 1.38% w/v aqueous solution is isoosmotic with <br>serum.
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