The first basic method of chemical experiments: extraction, ra-extraction-aggregation, meta-extraction-aggregation, and extraction, tomato soup, tomato soup, using the different solubility of substances in immiscible solvents, using one solvent to extract the substance from the solution composed of it and another solvent, this method is called extraction.

Extraction of separating funnel Liquid separating funnel experiment 1-4 Extract iodine water (saturated) with L4 Phenomenon I: liquid stratification, upper liquid color development, lower liquid color development without purple red (see textbook for detailed steps) Instrument: separating funnel, iron frame with iron ring, beaker press the mouth of the separating funnel with the right hand, hold the piston part with the left hand, and turn the separating funnel upside down and shake; After oscillation, the piston is opened to release the gas in the funnel.

4. After the liquid is stratified, open the glass stopper on the mouth of the separating funnel, and then unscrew the piston under the separating funnel to make the lower liquid flow down the beaker wall slowly.

Scientific Inquiry - Selection of ExtractantsExperimental Purpose: To explore the basis for the selection of extractantsWhat is the basis for the selection of extractants: water, carbon tetrachloride, alcohol, gasoline, iodine water extractants?

The extractant is not miscible with the original solvent. Thinking and communicating the solubility of solutes in the extractant is greater than in the original solvent.

The solubility of the extractant and the original solvent is greater in the extractant than in the original solvent The solute does not react with the extractant.

Why should you open the glass stopper on the neck of the dispensing funnel or align the grooves (or holes) in the plug with the holes in the funnel when thinking about dispensing with communication?

Key points of operation when separating the funnel when dispensing: 1. Before dispensing, check whether the funnel and the glass plug on the upper mouth are leaking, open the glass plug on the upper mouth of the funnel or align the groove on the plug with the hole on the funnel mouth, so that the air inside and outside the funnel are connected, the lower end of the funnel is close to the inner wall of the beaker, 4 When the liquid is separated, the lower liquid flows out from the lower mouth, the upper liquid is poured out from the upper mouth, and the two liquids that are immiscible with each other are separatedOperation steps: leak test, add extractant, shake and stand, pour out the liquid extraction, and the application of liquid extraction: natural flavors and drugs, disposal of nuclear fuel, etc.

Apparatus for extracting penicillin

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