A novice baker has left a critical ingredient out of their cookie recipe and the cookies won't rise. Solve the problem and make sure the same mistake won't happen again.
![Chocolate chip cookies. creativecommons.org/licenses/by/2.0>, via Wikimedia Commons.](/pbl/sites/files/pbl/styles/full_width_m/public/shared/Chocolate%20Chip%20Cookies.jpg.webp?itok=KVu-HqrT)
Problem written by: Emily Porchak
Curriculum items covered: Acid-base reactions, balancing equations, decomposition reactions.