Aqueous solution of NaHCO₃ is alkaline

NaHCO₃ undergoes anionic hydrolysis

${\mathrm{HCO}}_3^{-}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{H}}_2{\mathrm{CO}}_3+{\mathrm{OH}}^{-}$

NaHCO₃ undergoes anionic hydrolysis and forms strong base
P^H > 7
Note: The cation of strong base and anion of strong acids can't undergo  hydrolysis