You're right to question this! Solid sodium bicarbonate (NaHCO₃) is not typically used in the synthesis of tert-butyl chloride (t-BuCl). Instead, aqueous sodium bicarbonate is the preferred reagent. Here's why:

* Reaction Mechanism: The synthesis of t-BuCl usually involves the reaction of tert-butanol (t-BuOH) with hydrochloric acid (HCl). The reaction produces water as a byproduct:

t-BuOH + HCl → t-BuCl + H₂O

* Side Reactions: Water is a good nucleophile, and in the presence of HCl, it can compete with t-BuOH for the electrophilic chloride ion (Cl⁻). This leads to the formation of unwanted byproducts.

* Aqueous Sodium Bicarbonate's Role: Aqueous sodium bicarbonate acts as a base to neutralize the HCl and remove water from the reaction mixture. The bicarbonate ions (HCO₃⁻) react with H⁺ ions to form carbonic acid (H₂CO₃), which quickly decomposes into carbon dioxide (CO₂) and water:

HCO₃⁻ + H⁺ → H₂CO₃ → CO₂ + H₂O

This drives the equilibrium towards the formation of t-BuCl, as the water is removed.

In summary:

* Solid sodium bicarbonate: It's not used in the synthesis of t-BuCl because it's not readily soluble in the reaction mixture, and its solid form wouldn't be effective in neutralizing the HCl and removing water.

* Aqueous sodium bicarbonate: It's used because it provides a source of bicarbonate ions to neutralize the HCl, remove water, and promote the desired reaction.

Let me know if you have any other questions!