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Using 1mol/L (NH_4)_2SO_4-aturated (NH_4)_2C_2O_4 as a masking reagent, V-△V/△pH, V-pH and back-titration methods are used to assay the concentration of nitric acid under various conditions and theresults are compared with that from phenolphthalein indicator method. It is shown that the data treatment
V-ΔV / Δ pH, V-pH and back-titration methods are used to assay the concentration of nitric acid under various conditions and the results are compared with that from phenolphthalein indicator method. It is shown that the data treatment