Final answer:
Lidocaine and procaine are local anesthetics that can have bicarbonate added to reduce pain upon injection.
Step-by-step explanation:
Not all local anesthetics can have bicarbonate added, but lidocaine and procaine are two local anesthetics that can have bicarbonate added. The addition of bicarbonate helps to increase the pH of the solution, making it less acidic and reducing the pain upon injection. This can be particularly useful in dental work or other procedures where a less painful injection is desired.