Anhydrous 201.22 [1330-43-4].
» Sodium Borate contains an amount of Na2B4O7 equivalent to not less than 99.0 percent and not more than 105.0 percent of Na2B4O7·10H2O.
Packaging and storage Preserve in tight containers.
Carbonate and bicarbonate To 5 mL of a solution (1 in 20), contained in a test tube, add 1 mL of 3 N hydrochloric acid: no effervescence is observed.
Heavy metals 231 Dissolve 1 g in 16 mL of water and 6 mL of 1 N hydrochloric acid, and dilute with water to 25 mL: the limit is 0.002%.
Assay Dissolve about 3 g of Sodium Borate, accurately weighed, in 50 mL of water, add methyl red TS, and titrate with 0.5 N hydrochloric acid VS. [noteHeating on a steam bath may be required initially to effect solution.] Each mL of 0.5 N hydrochloric acid is equivalent to 95.34 mg of Na2B4O7·10H2O.
Auxiliary Information Please check for your question in the FAQs before contacting USP.Chromatographic Column
USP32NF27 Page 1340
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.