Why Do Liquid-Liquid Extracts

The objective of this extraction experiment was to achieve a comprehensive understanding, as well as master the practice, of the technique of separating various individual components of a compound.

Multiple extractions with smaller volumes are more efficient than a single extraction at a one large volume. When an organic solvent is used to extract a compound from the aqueous solvent, smaller volumes will result in a better extraction. The success upon the collection of the crude material is depended on how well the water is absorbed by the anhydrous drying material. The presence of the drying material correlates with the vapor pressure of the other compound. When the vapor pressure is low, there is a smaller amount of moisture in the gas produced. Once the anhydrous material is added and clumping was avoided, the evaporation of the added organic substance can proceed. The final material collected can be physically identified by the final color of the precipitate. A greenish- white precipitate is most likely identified to be pure, and a brownish color indicates that the collected material is wet, and not

The percent recovery was calculated by finding the moles of the initial and final products. The moles of the initial product were found by multiplying the volume used by the density of 2-methyl-2-butanol, and then dividing by the molar mass. The percent recovery was good, showing few errors were made and that the lab went as expected. To improve the recovery, the extractions could be done even more carefully.

The experiment began with the construction of a Berlese funnel, which is an apparatus used to extract

In experiment 2, we used liquid-liquid extraction to separate a mixture using two immiscible solvents. We made use of extraction, back extraction, neutralization, and melting point technique to figure out the identity of the acid, base and neutral from the combined unknown mixture. There were a couple things that we had to pay close attention to. For example, identifying the organic and aqueous layer as liquid-liquid extraction is usually used to separate organic product from the mixing with the aqueous layer. Also, if precipitation did not form, we would need to add in MTBE solution and dry the solution with small amount of sodium sulfate.

The purpose of this lab was to use simple distillation and fractional distillation to separate an unknown mixture of heptane and hexane. Additionally, gas chromatography (GC) was used to analyze and determine the percent composition of three samples taken during fractional distillation.

In this experiment were used three separation techniques: extraction, sublimation and recrystallization. During the first method, 0.70 g sample of salicylic acid-naphthalene mixture was dissolved in 10 ml of diethyl ether. The solution was placed in a separatory funnel and 10 ml of saturated aqueous sodium bicarbonate solution was added to it. After the initial gas was

Microscale involves using smaller amounts of chemicals and solids. Therefore, the purpose is to determine the density, solubility, recrystallization, extraction, separation, and drying of products by using small quantities. The mass of volume was determined by using the density formula: Density= Weight (g) / volume (mL). Solubility is defined as the extent to which a substance is soluble. Crystallization is a technique used for purifying solid compounds. The percent recovery determined how much of the substance would remain after purification by calculating: (amount of pure substance collected) / (amount of impure substance began with) x 100. The separation of two liquid layers or purifying organic reaction products is identified as extraction and is used to establish a state of equilibrium.

After incubating for 7 days, spheres increase in size and range from 40-120 µm. For serial passaging, spheres were harvested using 40 µm cell strainers (filters), trypsinised to dissociate into single cells and then grown again for 4 days in the same conditions.

Prepared column chromatography set-up by placing a plug of glass wool at the base of a 25.0 mL buret, clamped the buret to a ring stand and placed a waste beaker under it. Added a 2cm layer of sand. Added 11.5 grams of silica gel to the buret, funneling through a separatory funnel, tapping buret column to prevent air pockets. Finally added a 2 cm layer of sand.

In solid-liquid extractions, a solvent is added to a solid. The insoluble material can then be separated by either gravity or vacuum filtration. This allows the soluble material to be 'extracted ' into the solvent. The filtered solution can then be used as a solution, or the solvent can be evaporated to recover the solute in powder or crystalline form In liquid-liquid extractions, extraction methods differ depending on the density of the solvent that is used.

Filter the precipitate (casein) by pressing through a funnel containing cotton; collect the filtrate in a beaker. Add about 1g anhydrous calcium carbonate to the filtrate. Boil the filtrate with stirring for about 10

To compare percent of the yield between Methanol and Hexane by using Soxhlet Extraction Method and percent of yield from Microwave Assisted Extraction

A three stage homogenate extraction method in the literature is found to be preferable to discuss here, as it is more advantageous and hence promising for inulin extraction. In this method repeated mincing of the tuber along with multiple stages of extraction was made use of, to assure maximum extraction of the compound . The steps used were:

Abstract: The aim of this research was to investigate the influence of time of extraction methods on