Baking soda (edible) is a leavening agent used in baked goods like cakes, muffins, and cookies. You can still use baking soda as a base for a baking powder substitute. Meaning you use ¼ teaspoon baking soda to replace 1 teaspoon of baking powder.
We do have people drinking Baking soda (edible) for immediate relief from occasional acid reflux. The recommended dosage for adults is 1/2 teaspoon dissolved in a 4-ounce glass of water. It’s best to sip this drink slowly to avoid side effects like gas and diarrhoea. You can repeat every two hours and many more usage for others purpose.
Cornstarch has a place in almost every recipe. This starch is often used as a thickening agent in stir fries dishes, soups, sauces and some of the baking like pie, tart or egg replacement.