Liquid separation is to separate the twoMiscibilityOperation method of liquid separation.The instrument used for liquid separation isSeparating funnelIn addition, liquid separation also requiresBeakerAndIron trestleAssist.
Liquid separationIt is to separate the twoMiscibilityThe operating method for separating liquid from water. For example, usecarbon tetrachlorideTo separate iodine in iodine waterLiquid separation methodSeparate carbon tetrachloride solution of iodine from water.
instrument
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Common separating funnel in laboratory
Liquid separationThe instruments used areSeparating funnelThere are three kinds of separating funnels: spherical, pear shaped (or conical) and cylindrical.Pear shaped and cylindrical separating funnels are mostly used for separating liquid.The spherical separating funnel is not only used for adding liquid, but also used for separating liquid.The specification of separating funnel is expressed by volume, which is usually 60 mL, 125 mL and other scales.
In addition, beaker and iron stand are also needed for liquid separation.
operation
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Liquid separationThe operation steps are as follows: first, use an ordinary funnel to inject the liquid to be separated into the separating funnel, plug it, and then put the separating funnelStand stillstayFunnel rackUpper or in the iron ring of the iron stand (if it is necessary to shake the liquid, it should be fully shaken before standing). After the liquid is divided into two layers, unscrew the cock to make the lower liquidFunnel tubeFlow down. Before unscrewing the cock, align the groove or small hole on the piston at the top of the separating funnel with the funnelUpper mouthThe small hole in the neck, or take down the top piston to connect with the atmosphere, otherwise, the liquid cannot flow out from the lower mouth through the cock. When the lower liquid runs out, close the cock immediately, and then pour the upper liquid out from the upper mouth of the funnel.
matters needing attention
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Liquid separation process
1. Before use, the glass piston should be leak checked, and if there is water leakage, it should be coated with a thin layerVaseline, but not too much, so as not to block the flow hole.When in use, the left hand wedge is pressed against the funnel ball, and the thumb forefinger is used to rotate the piston to control the liquid filling.At this time, the small groove of the glass plug should be aligned with the hole on the side of the funnel mouth, so that the liquid filling can be carried out smoothly.
2. When working as a dispenser, the lower end of the funnel should not be immersed below the liquid level.
3. During oscillation, the small groove of the plug shall be staggered with the small hole on the side of the funnel mouth and sealed tightly.When separating the liquid, the lower liquid flows out of the funnel neck (close to the beaker wall), and the upper liquid should be poured out of the funnel mouth. Close the piston in time to prevent the upper liquid from flowing into the beaker.
4. When the separating funnel is not used for a long time, a piece of paper should be clamped on the piston surface to prevent adhesion.And a rubber band is used to cover the piston to avoid loss.
