0.1 N Potassium Bromide–Bromate VS
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
Dissolve 2.78 g of potassium bromate (KBrO3) and 12.0 g of potassium bromide (KBr) in water, and dilute with water to 1000 ml..
Standardization: Transfer an accurately measured volume of about 40 mL of the solution to a glass-stoppered flask, add 3 g of potassium jodide, and follow with 3 mL of hydrochloric acid. Allow to stand for 5 min, then titrate the liberated iodine with 0.1 N sodium thiosulfate VS, adding 3 mL of starch TS as the endpoint is approached. Correct for a blank run on the same quantities of the same reagents, and calculate the normality.
N = (mL Na2S2O3 x N Na2S2O3)/(mL KBrO3/KBr)
[NOTE-If this volumetric solution is used in a qualitative application such as pH adjustment, dissolution medium, or diluent, its standardization is not required.]
