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There are many exothermic reactions, but that of water and fuming sulfuric acid is one of the best known among them. When fuming sulfuric acid was added to concentrated sulfuric acid in certain definite portions, the temperature of the solution rose as shown by A, B, and C in the figure ; butafter the entire water combined with fuming sulfuric acid, the temperature rose no more as shownby D, E and F1) Therefore, the intersection of the lines ABC and DEF could be considered as the endpoint of the chemical reaction : H2O +SO3 =H2SO4. Such a thermometric titration as just described may be used to test the quality

Analysis of Concentrated Sulfuric Acid and Fuming Sulfuric Acid by Thermometric Titration