Baron Hasslinger Chemistry Like Dissolves Like — a Demonstration of Polarity Aim: To illustrate that polar solutes dissolve in polar solvents and that non-polar solutes dissolve in non-polar solvents by mixing polar and non-polar solutions in test tubes. Material: • Lab coats and safety spectacles • A fume cupboard • Heptane • Water • Potassium Permanganate • Iodine • 2 test tubes • 4 small flasks Method: (Wear safety specs and lab coats) • Prepare 4 small flasks containing: • A Heptane • B
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trends Melting point – Among disubstituted aryl dihalides‚ para isomer has unusually high MP; ~70 – 100 °C higher than ortho and meta isomers Solubility behavior – insoluble in water; soluble in nonpolar organic solvents – para isomer is less soluble than ortho or meta in any given solvent can be readily purified by recrystallization Consider: REACTIONS: 1. Electrophilic aromatic substitution (EAS) – recall directing power (o‚ p director) but ring is deactivated toward EAS. 2. Nucleophilic
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as one organic solvent. Pigments choose the organic layer over the tomato paste with water‚ which allowed for their extraction. K2CO3 is an ionic base that was added to deprotonate the citric acid. The ionic product of the reaction in figure 3 now prefers the aqueous layer‚ which serves to wash the pigments of the acidic impurity. Saturated NaCl pulls any water into the aqueous layer. MgSO4 was used as a drying agent to evaporate off the 50/50 acetone/hexane organic solvent. A rotovap was
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Since the Grignard reagent can easily react with water‚ all glassware including the 25 ml round bottom flask‚ magnetic stir bar‚ 3 and 5 ml conical vial‚ 50 mL Erlenmeyer flask‚ claisen adapter‚ drying tube and 5 glass pasteur pipets were first added to a 250mL beaker and placed in the oven for 30 minutes. After the completion of the thirty minutes‚ 0.150 g of shiny magnesium turnings and a stir bar was first added to the round bottom flask and the claisen adapter along with the drying tube packed
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International Journal of Pharma and Bio Sciences RESEARCH ARTICLE ARTICALTICLE MEDICINAL CHEMISTRY SYNTHESIS‚ CHARACTERIZATION AND BIOLOGICAL STUDIES OF SCHIFF BASES METAL COMPLEXES CO (II)‚ ZN (II)‚ NI (II)‚ AND MN (II) DERIVED FROM AMOXICILLIN TRIHYDRATE WITH VARIOUS ALDEHYDES. Corresponding Author SUNIL JOSHI Synthetic Lab‚ P. G. Department of Chemistry‚ Faculty of Science‚ Government College‚ Ajmer‚ Rajasthan (INDIA). Co Authors VATSALA PAWAR ‚ AND V.UMA Synthetic Lab‚ P. G
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drops of the sodium thiosulfate solution‚ then reconnect the vacuum. 16. Follow with 1 or 2 washings of ice cold water. 17. Dry the crude product 5-10 minutes using the vacuum. 18. Recrystallize the crude product using an ethanol/water mixed solvent combination. Be sure to dissolve the crude product in the minimal
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started by making my own flow sheet of how I thought this lab would work. I was reminded about solubility which is defined as the amount of the solute that will dissolve in a given amount of solvent and that the extent to which a substance dissolves depends mainly upon the physical properties of the solvent and of the solute and to some extent upon the solvent’s temperature. With that being said I came to the conclusions that the salt would need hot water to separate from the mixture‚ the benzoic
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an alkaloid ‚ a term used for substances produced as end products of nitrogen metabolism in some plants. The chemical formula is C 8 H 10 N 4 O 2 . Caffeine has a molar mass of 194.19 grams (6.85 ounces). It is soluble in water and in many organic solvents‚ and it appears in pure form as white crystals. Caffeine can be prepared by extraction from natural sources or by synthesis from uric acid. The objectives involved in this experiment is to gain experience in using extraction as a method of separation
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Acetone is an extremely popular solvent that is used in rubber‚ resin‚ plastics‚ lacquers‚ varnishes‚ and rubber cements. It is also used in the creation of fats‚ oils‚ and waxes where is a primary component. Acetone has many uses in modern technology including those that relate to the medical field and various domestic uses. It is a very important organic compound found in everyday life‚ but it is also a toxin and can be an extremely dangerous environmental pollutant. Acetone has many valuable
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mixture that consisted of 50% benzoic acid‚ 40% benzoin‚ and 10% dibromobenzene. The benzoic acid was extracted by the use of base and extraction technique. Then a crystallization was performed in order to separate benzoin by the use of hexane a solvent‚ leaving the dibromobenzne in the mother liquor. The percent recovery for benzoic acid was 91.8% and 80.3% for the benzoin. The MP for benzoic acid was 119-122°C (1) and 135-136°C (2)for the benzoin. The high percent recovery and closeness of measured
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