0.05 N Ceric Ammonium Nitrate 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)
▲▲(USP 1-Aug-2020)
Dissolve 2.75 g of ceric ammonium nitrate in 1 N nitric acid to obtain 100 mL of solution, and filter.
1 Standardization
▲See Volumetric Solutions. 1. Definitions.
See Titrimetry (541).
Standardize by one of the following procedures. [NOTE-Other standardization procedures may be used. See Volumetric Solutions. 2. Preparation and Standardization, 2.3 Standardization.]
1.1 Standardization with visual endpoint
▲(USP 1-Aug-2020) Accurately measure 10 mL of freshly standardized 0.1 N ferrous ammonium sulfate VS into a flask, and dilute with water to about 100 mL. Add 1 drop of nitrophenanthroline TS, and titrate with the ceric ammonium nitrate solution to a colorless endpoint.
N = [mL Fe(NH4)2(SO4)2 × N Fe (NH4)2(SO4)2] / [mL Ce(NO3)4 ⋅ 2NH4NO3]
1.2 Standardization with potentometric endpoint
Accurately measure 10 mL of freshly standardized 0.1 N ferrous ammonium sulfate VS into a flask, and dilute with water to about 100 mL. Titrate potentiometrically with the ceric ammonium nitrate solution using a combined platinum electrode.
N = [mL Fe(NH4)2(SO4)2 × N Fe (NH4)2(SO4)2] / [mL Ce(NO3)4 ⋅ 2NH4NO3] ▲(USP 1-Aug-2020)
[NOTE-If this volumetric solution is used in a qualitative application such as pH adjustment, dissolution medium, or diluent, its standardization is not required.]
