Baking soda (NaHCO3) in aqueous solution is classified as:
A weak base
Sodium bicarbonate, NaHCO3, is the salt formed from a strong base (NaOH) and a weak acid (carbonic acid, H2CO3).
When dissolved in water, the bicarbonate ion undergoes partial hydrolysis, \(HCO_3^- + H_2O \rightleftharpoons H_2CO_3 + OH^-\), releasing a small amount of hydroxide ions. This makes the solution mildly alkaline (its pH is typically around 8-9), but the reaction is limited and reversible rather than the complete dissociation seen with strong bases.
Because it produces only a slight, incomplete basicity in water rather than a high concentration of hydroxide ions, baking soda's aqueous solution is classified as a weak base, not a strong base, neutral substance, or acid.
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