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Second Supplement to USP 35–NF 30 Solutions / Buffer ...

Second Supplement to USP 35 NF 30 Solutions / Buffer Solutions5773 Phosphate (Reagent test) Cut 5 strips into small pieces,card 1 cm from each end of each strip, and cut the remain-mix with 500 mg of magnesium nitrate in a porcelain cruci-der into squares or discs of diameter. Storeble, and ignite. To the residue add 5 mL of nitric acid, andin a glass-stoppered container wrapped with black to dryness: the residue shows not more than Green Iodomercurate Paper Immerse thinmg of of suitable filter paper in a 40g per L solution ofResidue on ignition Ignite carefully 10 strips of the papermethyl green, and allow to air-dry. Immerse the strips for 1to constant weight: the weight of the residue correspondshour in a solution containing 140g per L of potassium io-to not more than mg per strip of about 3 square and 200g per L of mercuric iodide. Wash with waterRosin acids Immerse a strip of the blue paper in a solu-until the washings are practically colorless, and allow to air-tion of 100 mg of silver nitrate in 50 mL of water: the colordry.

5774Buffer Solutions / Solutions Second Supplement to USP 35–NF 30 volumes shown for Acetate Buffer are used to prepare 1000 4. Boric Acid and Potassium Chloride, 0.2 M—Dissolve mL of buffer solution. 12.37 g of boric acid (H 3BO 3) and 14.91 g of potas- 1. Hydrochloric Acid, 0.2 M, and Sodium Hydroxide, 0.2 sium chloride (KCl) in water, and dilute with water to

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