亚硫酸氢钠是一种只能存在于溶液中的无机化合物，在常温下是不稳定的固体。在亚硫酸氢盐中，只有亚硫酸氢铷RbHSO3、亚硫酸氢铯CsHSO3和季铵盐NR4HSO3在室温下是稳定的。在空气中易氧化成硫酸盐。
Sodium bisulfite is an inorganic compound that can only exist in solution and is an unstable solid at room temperature. Among bisulfite salts, only rubidium bisulfite rbhso3, cesium bisulfite cshso3 and quaternary ammonium salt nr4hso3 are stable at room temperature. It is easy to oxidize into sulfate in the air.
市场上有NaHSO3，主要成分是焦亚硫酸钠Na2S2O5。
NaHSO3 is available on the market, and the main component is sodium pyrosulfite Na2S2O5.
准备
prepare
焦亚硫酸钠加水可制得，化学式为：Na2S2O5(s)H2O(l)→2NaHSO3(aq)
Sodium pyrosulfite can be prepared by adding water. The chemical formula is: Na2S2O5 (s) H2O (L) → 2nahso3 (AQ)
亚硫酸氢钠也可以通过氢氧化钠或碳酸氢钠与二氧化硫反应生成：SO2氢氧化钠→NaHSO3；SO2NaHCO3→NaHSO3CO2
Sodium bisulfite can also react with sulfur dioxide through sodium hydroxide or sodium bicarbonate: SO2, sodium hydroxide → NaHSO3; SO2NaHCO3→NaHSO3CO2
然而，尝试结晶该化合物仅产生焦亚硫酸钠，化学式为Na2S2O5。
However, trying to crystallize the compound only produces sodium pyrosulfite, with the chemical formula of Na2S2O5.
反应
reaction
亚硫酸氢钠与活性醛和酮反应形成亚硫酸氢钠加合物。该反应可用于避免在加成羰基和HCN时使用剧毒HCN。方法如下：先将羰基化合物加入亚硫酸氢钠中，再加入等量的NaCN。
Sodium bisulfite reacts with active aldehydes and ketones to form sodium bisulfite adducts. This reaction can be used to avoid the use of highly toxic HCN in the addition of carbonyl and HCN. The method is as follows: first add carbonyl compounds to sodium bisulfite, and then add the same amount of NaCN.
预防
prevention
氢氧化钾厂家建议人们不要摄入超过0.7mg/kg的亚硫酸氢钠。对亚硫酸盐过敏的人不应食用含有E220-229（所有亚硫酸盐，包括E222、亚硫酸氢钠）的食物。亚硫酸氢钠与酸接触会产生有毒气体。
Potassium hydroxide manufacturers advise people not to consume more than 0.7mg/kg sodium bisulfite. People who are allergic to sulfites should not eat food containing e220-229 (all sulfites, including e222 and sodium bisulfite). Contact between sodium bisulfite and acid will produce toxic gas.

处置与储存
Disposal and storage
操作：密闭操作，加强通风。操作人员须经过专门培训，严格遵守操作规程。建议操作人员佩戴自吸过滤式防尘口罩，戴化学安全防护眼镜，穿防毒物渗透工作服，戴橡胶手套。避免产生粉尘。避免与酸类接触。搬运时轻装轻卸，防止包装破损。配备泄漏应急处理设备。倒空的容器可能残留有害物。
Operation: closed operation, strengthen ventilation. Operators must receive special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter type dust masks, chemical safety protective glasses, poison proof overalls and rubber gloves. Avoid dust generation. Avoid contact with acids. Handle with care to prevent package damage. Equipped with leakage emergency treatment equipment. Emptied containers may leave harmful substances.
储存：储存于阴凉、通风的库房。远离火种、热源。应与酸类等分开存放，切忌混储。不宜久存。储区应备有合适的材料收容泄漏物。
Storage: store in a cool and ventilated warehouse. Keep away from kindling and heat sources. It should be stored separately from acids and avoid mixed storage. It should not be stored for a long time. The storage area should be equipped with appropriate materials to contain leakage.
运输：起运时包装要完整，装载应稳妥。运输过程中要确保容器不泄漏、不倒塌、不坠落、不损坏。严禁与酸类、食用化学品等混装混运。运输途中应防曝晒、雨淋，防高温。车辆运输完毕应进行清扫。
Transportation: the package shall be complete and the loading shall be stable at the time of shipment. Ensure that the container does not leak, collapse, fall or damage during transportation. It is strictly prohibited to mix with acids, edible chemicals, etc. During transportation, it shall be protected from sun exposure, rain and high temperature. The vehicle shall be cleaned after transportation.
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