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Dissolve 1.0 g in carbon dioxide-free water R and dilute to 20 ml with the same  solvent.

To 1 ml of solution S add 0.2 ml of dilute nitric acid R and 0.2 ml of silver nitrate solution R2. A grey precipitate is formed.

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Water R
Purified water as defined in the monograph for Purified water.
Note: Unless otherwise specified, all solutions indicated in the tests and assays of The International Pharmacopoeia are prepared with water R.
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