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3. sodium hydrogen carbonate

Wiktionary

sodium hydrogen carbonate

n. sodium bicarbonate (gloss: NaHCO₃)

WordNet

sodium hydrogen carbonate

n. a white soluble compound (NaHCO3) used in effervescent drinks and in baking powders and as an antacid [syn: bicarbonate of soda, sodium bicarbonate, baking soda, saleratus]