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.
6. Make a corn, rice, or potato paste. Mix cornflour, rice flour, or potato flour with water until you have formed a thick paste. Whisk this into the soup until the soup thickens. You can also use wine, stock, or other liquid in place of the water for making the paste.. Use cornstarch. This method will thicken the soup without as much additional cook-time as the flour method. Put about a tablespoon of starch in a container and add just enough cold water to make a thick slurry or paste.