becomes colourless. Cool and add cautiously about 20 ml of water and mix The resulting solution complies wrth the limit test for arsenic, Appendix 3.9

ml of arsenic standard solution (10 ppm As) and dipping the stained mercunc chloride papers from the test and standard solutions in a 10% w/v solution of potassium iodide before comparison of the stains (10 ppm) Loss on dryrng. Not more than 5 5%, determined on 1 g by drying in an oven at 105*. Appendix 8.6 Assay Weigh accurately about 04 g, dissolve in a mixture of 40 ml of ethanol (95%) and !0 ml of 0 01M hydrochlonc acid and titrate with 0 05M iodine until a yellow colour stable for 30 seconds is produced Each ml of 0 05M iodine is equivalent to 0 becomes colourless. Cool and add cautiously about 20 ml of water and mix The resulting solution complies wrth the limit test for arsenic, Appendix 3.9, but using 01667 g of C13H16NaO4S AWALGIN TABLETS Metamizol TabletsUsual strength 500 mg Storage Store in tightly-closed containers STANDARDSAnalgm Tablets contain not less than 95 0 per cent and not more than 105 0 per cent of the stated amount of analgin, C13H16N3NaO4S.H O Identification Powder a few tablets and shake a quantity of the powder equivalent to about 0 5 g of Analgin with 10 ml of water and fitter The filtrate complies with the tests described under Analgin Other requirements Comply with the requirements of tests stated under Tablets Assay. Weigh and powdar 20 tablets Weigh accurately a quantity of the powder equivalent