The best replacement for bicarbonate is sodium carbonate.

The best alternatives to bicarbonate are rated as following:
★★★★★  sodium carbonate
★★★  baking soda
★★★  carbonate
★★  carbon dioxide
★★  sodium bicarbonate
★★  sodium hydroxide
★  calcium carbonate
★  soda ash
★  sodium chloride
★  sodium citrate
★  baking powder
★  potassium citrate
★  potassium bicarbonate
★  alkalinity
★  potassium chloride
★  carbonic acid
★  sodium acetate
  sodium hydrogen carbonate
  potassium carbonate
  total co2
  lactate
  magnesium hydroxide
  hydrogen carbonate

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Speaking about bicarbonate, one probably shouldn't forget about lidocaine.

Other search terms related to bicarbonate and their ratings are:
★★★★★ lidocaine
★★★★★ acid
★★★★★ acetic acid
★★★★ citric acid
★★★★ hydrochloric acid
★★★★ sulfuric acid
★★ acids
★ benzoic acid
carboxylic acid
dka
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Google Trends

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bicarbonate
sodium carbonate
baking soda