Gravity Filtration Filter Paper

Two filtration techniques are generally used in chemical separations in general chemistry lab.

Gravity filtration filter paper.

Vacuum filtration is faster than gravity filtration because the solvent or solution and air is forced through the filter paper by the application of reduced pressure. Gravity filtration and vacuum filtration. The resulting filtration quality is determined by a combination of these factors. Gravity filtration is generally used when the filtrate liquid that has passed through the filter paper will be retained while the solid on the filter paper will be discarded.

Remember never use vacuum filtration to filter a solid from a liquid if you want to use the liquid and the solvent boiling at about 125 degrees or lower will boil off in the vacuum flask while the pressure is reduced. The most basic form of filtration is using gravity to filter a mixture. Gravity filtration is often used in chemical laboratories to filter precipitates from precipitation reactions as well as drying agents inadmissible side items or remaining reactants. A membrane filter paper that allows the passage of liquid the filtrate and results in the collection of the solid.

A common use for gravity filtration is for separating anhydrous magnesium sulfate ce mgso4 from an organic solution that it has dried figure 1 68b. Media is provided in a wide range of porosity to handle varying flow rates viscosities and contaminants. This video outlines a procedure for gravity filtration and shows how to fold a fluted filter paper. The two main kinds of filtration used in laboratories are gravity and vacuum suction.

Similar to gravity filtration a solid liquid mixture is poured onto a filter paper with the main difference being that the process is aided by suction beneath the funnel figures 1 70 1 71. Gravity filtration is a method of filtering impurities from solutions by using gravity to pull liquid through a filter. Do not use vacuum filtration to filter a solid from a liquid if it is the liquid that you want and if the liquid is low boiling. The paper bed filter operates on the principle of a low head of fluid flowing by gravity through filter media.

The mixture is poured from above onto a filter medium e g filter paper and gravity pulls the liquid down. The process has advantages and disadvantages in comparison to gravity filtration.