碳酸钠 Traditional form: 碳酸鈉 Pinyin (reading): tànsuānnà Definitions: soda sodium carbonate (chemistry) Characters: 碳 - carbon 酸 - tart, sour; spoiled; acid 钠 - sodium, natrium; to sharpen wood Traditional characters: 碳 - carbon 酸 - tart, sour; spoiled; acid 鈉 - sodium, natrium; to sharpen wood