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tras conectar el frasco de woulff, según se indica en la figura 2, con la bomba de succión de agua se introduce el tubo 2 en la solución del punto 4.7.
after connecting the woulff bottle, as shown in figure 2, with the water suction pump tube 2 is dipped into the solution according to section 4.7.
al cabo de 20 o 30 minutos, el frasco de woulff es sustituido por un frasco de vacío y se vacía la columna conectándola con la bomba de succión de agua (véase la figura 3).
after 20-30 min the woulff bottle is replaced by a filter flask and the column emptied by connecting it with the water suction pump (see figure 3).