How much soda per cup buttermilk in baking?

When using soda in baking with buttermilk, a common ratio is to use about 1/2 to 1 teaspoon of baking soda for every cup of buttermilk. The acidity of the buttermilk activates the baking soda, helping the baked goods rise. Adjusting the amount may depend on the specific recipe and desired texture. Always ensure to balance the acidity with the right amount of soda for optimal results.