The best replacement for sodium carbonate is sodium bicarbonate.

The best alternatives to sodium carbonate are rated as following:
★★★★★  sodium bicarbonate
★★  bicarbonate
★★  soda ash
★★  potassium carbonate
★  sodium hydroxide
★  calcium carbonate
★  sodium chloride
★  sodium percarbonate
  washing soda
  sodium hydrogen carbonate
  bicarbonate of soda
  sodium borate

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Speaking about sodium carbonate, one probably shouldn't forget about hcl.

Other search terms related to sodium carbonate and their ratings are:
★★★★★ hcl
★★★★★ calcium chloride
★★★★ sulfuric acid
★★★★ acetic acid
★★★ hydrochloric acid
★★★ nitric acid
★★★ silver nitrate
★★★ copper ii sulfate
★★ magnesium chloride
★★ barium chloride
★ copper sulfate
★ ethanoic acid
ethanol
phenolphthalein
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sodium carbonate
sodium bicarbonate
bicarbonate