碳酸氢钠
碳酸氢钠（sodium bicarbonate、IUPAC名: sodium hydrogen carbonate、baking soda）是一种无机化合物，化学式为NaHCO3，俗称小苏打、苏打粉、重曹、焙用碱等，白色细小晶体，拉水中个溶解度小于碳酸钠，呈弱碱性。
50℃以上开始逐渐分解生成碳酸钠、二氧化碳搭水，270℃辰光完全分解。
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