Diluted Hydrochloric Acid
» Diluted Hydrochloric Acid contains, in each 100 mL, not less than 9.5 g and not more than 10.5 g of HCl.
Diluted Hydrochloric Acid may be prepared as follows:
Mix the ingredients.
Packaging and storage Preserve in tight containers.
Identification It responds to the tests for Chloride 191.
Residue on ignition 281 To 20 mL add 2 drops of sulfuric acid, evaporate to dryness, and ignite: the weight of the residue does not exceed 2 mg.
Sulfate To a mixture of 3 mL of it and 5 mL of water add 5 drops of barium chloride TS: neither turbidity nor precipitate appears within 1 hour.
Sulfite On the completion of the test for Sulfate, the further addition to the liquid of 2 drops of 0.1 N iodine produces neither turbidity nor decolorization of the iodine.
Heavy metals 231 To 3.8 mL (4 g) add 5 mL of water and 1 drop of phenolphthalein TS. Add 6 N ammonium hydroxide until the solution assumes a faint pink color. Add 2 mL of 1 N acetic acid, then add water to make 25 mL: the limit is 5 ppm.
Free bromine or chlorine To 10 mL add 1 mL of potassium iodide TS and 1 mL of chloroform, and agitate the mixture: the chloroform remains free from any violet coloration for at least 1 minute.
Assay Transfer 10.0 mL of Diluted Hydrochloric Acid to a conical flask, and add about 20 mL of water. Add 3 drops of methyl red TS, and titrate with 1 N sodium hydroxide VS. Each mL of 1 N sodium hydroxide is equivalent to 36.46 mg of HCl.
Auxiliary Information Please check for your question in the FAQs before contacting USP.Chromatographic Column
USP32NF27 Page 1249
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.