白色正交雙錐體結(jié)晶或結(jié)晶性粉末。有苦咸味，無(wú)臭。熔點(diǎn)約800℃；d2.7。有吸潮性，易在潮濕空氣中吸收三分子水。能溶于水和甘油，不溶于乙醇。水溶液呈中性。33℃時(shí)溶解度最大(1：2)，溫度再高溶解度降低，100℃時(shí)溶于2.4份水。當(dāng)水溶液低于32. 38℃時(shí)，則以十水物結(jié)晶析出，高于32. 38℃時(shí)開(kāi)始以無(wú)水硫酸鈉結(jié)晶析出。
White orthogonal bipyramidal crystal or crystalline powder. Bitter and salty, odorless. Melting point about 800℃; d2.7. Moisture absorption, easy to absorb three molecules of water in humid air. Soluble in water and glycerin, insoluble in ethanol. The aqueous solution is neutral. The solubility is maximum at 33℃ (1:2), the solubility decreases at higher temperature, and the solubility is dissolved in 2.4 parts of water at 100℃. When the aqueous solution is lower than 32.38 ℃, it crystallizes out as decahydrate, and when it is higher than 32.38 ℃, it begins to crystallize out as anhydrous sodium sulfate.
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