碳酸钠 tànsuānnà sodium carbonate Origin Definitions Defs Strokes Stroke Words Sentences Sents 碳酸 tànsuān carbonic acid carbonic acid; a weak inorganic acid formed by dissolving 二氧化碳 èryǎnghuàtàn in water, used in making soft drinks and chemicals钠 鈉 nà noun sodium sodium; natrium (chemical element Na)