How much baking powder and soda should you add to an old cake mix make it raise?

Adding more baking powder and soda to an old cake mix won't necessarily make it rise. Here's why:

* Expired leavening agents: The leavening agents in cake mix (baking powder and baking soda) lose their potency over time. Adding more won't compensate for this loss.

* Chemical reaction: Leavening agents work by creating tiny air bubbles during baking. These bubbles help the cake rise. Adding more leavening agents won't guarantee more bubbles if the existing ones are already inactive.

* Other factors: A cake mix's ability to rise also depends on the other ingredients, like the eggs, fat (oil or butter), and moisture. An old mix may be dried out, making it harder to rise.

Instead of adding more leavening agents, try these tips:

* Check the expiration date: If the mix is significantly past its expiration date, it's unlikely to rise well.

* Add a little extra liquid: If the mix seems dry, add a bit of milk or water to help activate the leavening agents.

* Use fresh ingredients: Ensure that your eggs are fresh and your butter or oil is not rancid.

* Don't overmix: Overmixing can develop gluten, making the cake tough and dense.

* Bake at the correct temperature: A cake needs to be baked at the right temperature for the leavening agents to work properly.

Important Note: If you're unsure about the freshness of your cake mix, it's best to start fresh with a new one.