J.R. S. answered 10/29/22
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NaHCO3 + acid:
NaHCO3 + HCl ==> NaCl + H2CO3 ==> NaCl + H2O + CO2 little change in pH
NaHCO3 + base
NaHCO3 + NaOH ==> Na2CO3 + H2O little change in pH