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.
up vote 8 down vote. If you want to thicken it fast use flour, just don't add it directly to the pot (If you do, the flour will clump and you'll spend the next couple of hours trying to de-clump the clumps). Use a bowl. To the bowl, add 1-2 tablespoons of flour and a cup of hot liquid from the chili.f you want to thicken it fast use flour, just don't add it directly to the pot (If you do, the flour will clump and you'll spend the next couple of hours trying to de-clump the clumps). Use a bowl. To the bowl, add 1-2 tablespoons of flour and a cup of hot liquid from the chili.