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UNIVERSIDAD ARTURO MICHELENA
FACULTAD DE CIENCIAS DE LA SALUD
ESCUELA DE PATOLOGÍA MEDICA
CARRERA DE CITOTECNOLOGÍA

THE VOLUMETRIC FLASK
A flask is used to accurately measure a given volume ofliquid. The tick mark surrounds the neck of glass, making it easy to determine precisely when the liquid reaches the mark. The correct way to measure volumes is to bring the liquid to the bottom ofthe meniscus is tangent to the brand. The fact that the flask neck is narrower to increase the accuracy, thus a small change in volume results in a significant increase in the height of the liquid.The flasks are presented in volumes of 10 ml to 2 l. Its main use is to prepare solutions of known concentration and accurate. The usual procedure for the preparation of solutions is to weigh theamount of solute, pour it into the flask and add the solvent to a volume less than its capacity. Subsequently, the solute dissolves well and is filled to the mark (operation known as "make up"). that'snot good.

In the same way as for the pipettes, neck flask is constructed of relatively thin, so a small change in fluid volume causes a considerable difference in height of the meniscus, andconsequently the error by adjusting the meniscus the brand is very small.

Volumetric flasks are calibrated to contain specified volume of liquid at a definite temperature. As graduation surrounds theneck of the flask is easy to avoid parallax errors when bringing the liquid to the mark, aligning the eye so that the sides nearest and farthest from the ring tangent to the lower edge of the meniscus.It is essential that the flask is free of fat, especially in signal capacity or near ésta.Los flasks used to prepare solutions of known concentration for accurate dilutions.

Weigh or measurethe required amount of substance and transferred to the flask. Fill the flask with the minimum amount of liquid sufficient to dissolve or dilute the substance transferred to it (the height of the...