tareas
Packaging and storage: preserve in tight containers,preferably at a temperature not exceeding 35. avoid freezing.
Labeling: double or triple-strength milk of magnesia is so labeled, or may be labeled as 2 or 3 concentrated milk of magnesia, respectively.
identification: a solution of the equivalent of 1 g of regular-strength milk ofmagnesia in 2 ml of 3 n hydrochloric acid meets the requirements of the tests for magnesium
microbial: its total aerobic microbial count does not exceed 100 cfu per ml, and it meets the requirements of the test for absence of echarichacoli.
acid-neutralizing capacity: not less than 5 meq of acid is consumed by the minimum single dose recommended in the labeling, and not less tha the number of meqcalculated by the formula: 0.8(0.0343M) in which 0.0343 is the theoretical acid-netralizing capacity, in meq, of mg(oh)2; and Mis the quantity, in mg, of Mg(oh)2 in the specimen tested, based on the labele quantity.
soluble alkalies- centrifuge about 50 ml of milk of magnesia. dilute 5.0 ml of the clear supernatant wiht 40 ml of water. add 1 drop of metryl red TS, and titrate the solutionwith 0.10 N sulfuric acid to the production of a persistent pink color: not more than 1.0 ml of the acid is required. where the specimen is double- or triple-strength milk of magnesia not more than 2.0 or 2.0 ml of the acid is required, respectively.
CArbonate and acid-insoluble matter- to the equivalent of 1 g of regular-strength milk of magnesia add 2 ml of 3N hydrochloric acid: not more tha aslight effervescense occurs, and the solution is not more than slightly turbid.
Limit of calcium: Dilute hydrochloric acid, lanthanum solution, standard preparations, and blank slution- proceed as directed in the test for limit of calcium under magnesium carbonate.
test preparation- transfer the equivalent of 1.4 g of regular strength milk of magnesia to a beaker, add 60 ml of dilutehydrochloric acid, and stir until dissolved, heating if necessary. transfer the solution so ob tained to a 200-ml volumetric flask containing 4 ml of lanthanum solution, dilute with water to volumen, and mix
assay
assay: transfer an accurately measured quantity of milk of magnesia , previously shaken in its original container, equivalent to about 800 mg of magnesium hydroxide, to a 250 mlvolumetric flask. dissolve in 30 ml of 3 N hydrochloric acid, dilute with water to volume, and mix. filter, it necessary, and transfer 25.0 ml of the filtrate to a beaker containing 75 ml of water, and mix. adjust the reaction of the solution with 1N sodium hydroxide to a pH of 7( using pH indicator paper; see indicator and test papers under reagents, in the section reagents, indicators, and solutions),add 5 ml of ammonia-ammonium chloride buffer ts and 0.05 M edetate disodium vs to a blue endpoint. each ml of 0.05 M edetate disodium is equivalent to 2916 mg og MG
la leche de magnesia es una suspensión de hidróxido de magnesio. la leche de magnesia, leche doble resistencia de magnesia, y la leche triple fuerza de magnesia, no contener menos de 90,0 por ciento y no más del tha 115,0 porciento de la cantidad declarada de Mg (OH) 2, la cantidad declarada es de 80, 160 y 240 mg de Mg (OH) 2 por ml, respectivamente. puede contener más de 0,05 por ciento de un aceite volátil o una mezcla de aceites volátiles, propicio para dar sabor a los propósitos.
Embalaje y almacenaje: conservar en recipientes herméticos, preferiblemente a una temperatura no superior a 35. evitar la congelación....
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