Silver Nitrate
AgNO3 169.87

Nitric acid silver(1+) salt.
Silver(1+) nitrate [7761-88-8].
» Silver Nitrate, powdered and then dried in the dark over silica gel for 4 hours, contains not less than 99.8 percent and not more than 100.5 percent of AgNO3.
Packaging and storage— Preserve in tight, light-resistant containers.
Clarity and color of solution— A solution of 2 g in 20 mL of water is clear and colorless.
A: A solution (1 in 50) responds to the tests for Silver 191.
B: Mix a solution (1 in 10) in a test tube with 1 drop of diphenylamine TS, and then carefully superimpose it upon sulfuric acid: a deep blue color appears at the zone of contact.
Copper— To 5 mL of a solution (1 in 10) add 6 N ammonium hydroxide, dropwise, until a precipitate first formed is just dissolved: no blue color is produced.
Assay— Powder about 1 g of Silver Nitrate, and dry in the dark over silica gel for 4 hours. Weigh accurately about 700 mg of this dried salt, dissolve in 50 mL of water, add 2 mL of nitric acid and 2 mL of ferric ammonium sulfate TS, and titrate with 0.1 N ammonium thiocyanate VS. Each mL of 0.1 N ammonium thiocyanate is equivalent to 16.99 mg of AgNO3.
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Topic/Question Contact Expert Committee
Monograph Behnam Davani, Ph.D., M.B.A.
Senior Scientist
(MDAA05) Monograph Development-Antivirals and Antimicrobials
USP32–NF27 Page 3554