A mixture with a total volume of 650L consists of the following:
50kg hydrofluoric acid (50% w/w) with a specific gravity of 1.175, 40kg
Sulfuric Acid (98% w/w) with a specific gravity of 1.84, and the remaining volume is water. Find the ionic strength and pH of the resulting mixture. Hydrofluoric acid is replaced with ammonium bifluoride. What amount of ammonium bifluoride (1.5 g/cm3) and sulfuric acid must be used to obtain the same strength mixture as the original hydrofluoric mixture? Find the pH and ionic strength of the new mixture.