Baking soda (sodium bicarbonate, chem. NaHCO3) can help against heartburn, it neutralises gastric acid. It also helps to improve the body's acid-base balance and it is said to have anti-inflammatory effects.
After reading this first post I've found an old package at home and I add half a tea spoon to my drinks about twice a day to see if it helps me, but it is difficult to say. You should have it at least one hour before or after meals, because as said above it neutralises gastric acid which is needed for protein digestion.