How do I make baking powder using cornstarch and soda?

You can't actually make baking powder using cornstarch and soda. Here's why:

* Baking powder is a leavening agent that contains baking soda, an acid, and a drying agent (usually cornstarch).

* Baking soda is a base that needs an acid to react and create carbon dioxide bubbles, which are what make baked goods rise.

* Cornstarch helps prevent clumping and keeps the baking powder dry so it doesn't react prematurely.

You can't just mix baking soda and cornstarch because the acid component is missing.

Here's what you'll need to make your own baking powder:

* Baking soda: This is the base that reacts to create the bubbles.

* An acid: You can use cream of tartar, lemon juice, or vinegar.

* Cornstarch: This keeps the ingredients dry and prevents clumping.

Recipe for Homemade Baking Powder:

* 1 part baking soda

* 2 parts cream of tartar

* 1 part cornstarch

Instructions:

1. Combine all ingredients in a bowl.

2. Whisk thoroughly to ensure everything is well mixed.

3. Store in an airtight container in a cool, dry place.

Important Notes:

* Homemade baking powder is not as stable as store-bought baking powder and will lose its effectiveness over time. It's best to use it within a few months.

* Make sure to adjust your recipes accordingly when using homemade baking powder, as it may react differently than store-bought versions.

* If you don't have cream of tartar, you can use a combination of lemon juice or vinegar and baking soda, but the ratios will need to be adjusted based on the acidity of the liquid you choose.

If you're looking for a quick and easy solution, it's generally easier and more reliable to just buy store-bought baking powder.