$$ullet$$ The chemical formula of sodium hydrogen carbonate is $$NaHCO_3$$. $$ullet$$ Sodium hydrogen carbonate is a basic salt because it is prepared by the neutralization reaction of sodium hydroxide $$(NaOH)$$, a strong base and carbonic acid $$(H_2CO_3)$$, a weak acid.  $$ullet$$ The chemical equation for the neutralization reaction between sodium hydroxide and carbonic acid is as follows: $$NaOH+H_2CO_3\rightarrow NaHCO_3+H_2O$$ $$ extbf{Additional Information:}$$ The neutralization reaction of a strong base and a weak acid produces a basic salt and water.