Cool the solution, and add it slowly, with stirring, to a well-cooled mixture of 32 mL of nitric acid and 40 mL of water.

Such solutions should be so adjusted that when 0.15 mL of the indicator solution is added to 25 mL of carbon dioxide-free water, 0.25 mL of 0.02 N acid or alkali, respectively, will produce the characteristic color change.

Where no special directions for their preparation are given, the same solution is suitable for both purposes.

Mix 4 mL of acetaldehyde, 3 mL of alcohol, and 1 mL of water.

Dissolve 320 g of ammonium acetate in 500 mL of water, add 5 mL of glacial acetic acid, dilute with water to 1000.0 mL, and mix.

This solution has a pH between 5.9 and 6.0.

Determine the water content of a specimen of glacial acetic acid by the Titrimetric Method (see Water Determination 921 ).

If the acid contains more than 0.05 of water, add a few mL of acetic anhydride, mix, allow to stand overnight, and again determine the water content.

If the acid contains less than 0.02 of water, add sufficient water to make the final concentration between 0.02 and 0.05, mix, allow to stand overnight, and again determine the water content.

Dissolve 77.1 g of ammonium acetate in water, add 57 mL of glacial acetic acid, and dilute with water to 1000 mL.

Dissolve 8.15 g of sodium acetate and 42 g of sodium chloride in about 100 mL of water, and add 68 mL of 0.1 N hydrochloric acid and 150 mL of acetone.

Mix 60 mL of glacial acetic acid with 5 mL of sulfuric acid, add 1 mL of ferric chloride TS, mix, and cool.

Carefully separate the white from the yolk of a strictly fresh hens egg.

Shake the white with 100 mL of water until mixed and all but the chalaza has undergone solution; then filter.

Accurately weigh 5 g of sodium sulfite, 94.3 g of sodium bisulfite, and 700 mg of 1,2,4-aminonaphtholsulfonic acid, and mix.

Prepare aminonaphtholsulfonic acid TS fresh on the day of use by dissolving 1.5 g of the dry mixture in 10 mL of water.

Dissolve 67.5 g of ammonium chloride in water, add 570 mL of ammonium hydroxide, and dilute with water to 1000 mL.

Dissolve 2 g of potassium cyanide in 15 mL of ammonium hydroxide, and dilute with water to 100 mL.

It contains between 9.5 and 10.5 of NH 3.

Prepare by diluting 350 mL of Ammonia Water, Stronger (see in the section, Reagents ) with water to make 1000 mL.

Specific gravity: about 0.80.

It contains between 9 and 11 of NH 3.

Dissolve 2 g of potassium ferricyanide in 75 mL of water, add 25 mL of ammonium hydroxide, and mix.

Dissolve 20 g of ammonium carbonate and 20 mL of ammonia TS in water to make 100 mL.

Dissolve 10.5 g of ammonium chloride in water to make 100 mL.

Mix equal volumes of water and ammonium hydroxide, and saturate with ammonium chloride.

Dissolve 6.5 g of finely powdered molybdic acid in a mixture of 14 mL of water and 14.5 mL of ammonium hydroxide.

Dilute Ammonia Solution