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.
1 Grease a 9x13 inch pan. 2  In a heavy saucepan combine the 1/3 cup of flour and water. 3  Cook over medium heat stirring constantly until thick. 4  Transfer to a mixing bowl and set aside to cool. 5  In a small saucepan, melt butter. 6  When butter has melted, add the cocoa and mix until smooth; set aside to cool. Preheat oven to 350 degrees F (175 degrees C). 2  Grease a 9x13 inch pan. 3  In a heavy saucepan combine the 1/3 cup of flour and water. 4  Cook over medium heat stirring constantly until thick. 5  Transfer to a mixing bowl and set aside to cool.