Phosphonate salts are the result of deprotonation of phosphonic acids, which are diprotic acids: Phosphonate esters are the result of condensation of phosphonic acids with alcohols. Several methods exist for the preparation of phosphonic acids and their salts.
1 Stir in the tomato sauce, tomato paste, vinegar, diced tomatoes, and brown sugar. Season with chili powder, Italian seasoning, and salt. Bring to a boil, reduce heat to low, and simmer 1 hour.  Mix the cornstarch and water, and stir into the salsa to thicken. Transfer salsa to sterilized jars, leaving 1/2 inch headroom, and seal. Process jars in a boiling water bath 15 minutes. Store unsealed jars in the refrigerator.
Things You'll Need. Measure 1/4 cup of water in a measuring cup, and set it aside. Pour 1/4 cup of baking soda (use a measuring spoon) into the water. Stir the baking soda and water until the consistency is a thick paste. You don't want the paste to be too thin, otherwise it will not adhere well to the grill. If you need to, add more baking soda to thicken the paste to the desired level.