1. The problem statement, all variables and given/known data In a lab, i reacted NaHCO3 with HCl and put it under a steady flame and the reaction boiled. 1. What would indicate an excess of sodium bicarbonate instead of excess acid? is it precipitate? 2. Why was it necessary to add excess acid in the experiment? Is it so the NaHCO3 will completely react? 3. When the reaction boiled what gases were produced? CO2 ? If there is a better answer for this please suggest, Thank you.