white powder Mixture at room temp White cloudy liquid Mixture in ice bath White particles settled at the bottom of cloudy white liquid Suction Filtration Filtrate White powdery crystals Residue Clear yellowish liquid Crude Aspirin White powdery crystals Table 3. Recrystallization of Aspirin. Description Crude aspirin + EtOH Clear colorless liquid with undissolved white solids Mixture during heating Powdery white solids dissolve in clear colorless liquid Mixture after heating
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CALORIMETRY Abstract: During the experiment‚ the group were able to perform the following objectives; to compute the heat capacity of a Styrofoam-cup calorimeter‚ and also to compute the heat of neutralization of 1.0 M hydrochloric acid and 1.0 M sodium hydroxide‚ the heat of dilution of concentrated sulfuric acid‚ and the heat of solution of solid ammonium chloride The sixth experiment was named "Calorimetry" wherein it is the measurement of how much heat is gained or released by a system
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and stir until the mixture is smooth and clear (if the mixture is not turning smooth and clear‚ microwave it for an additional 15 to 20 seconds on high and stir again) * Sift 1 1/2 pounds of the sugar into a large bowl * Make a hole in the sugar and pour the liquid mixture to it * Stir with a wooden spoon until the mixture becomes sticky * Sift some of the remaining 1/2 pound of sugar onto a smooth work surface and add as much of the remaining sugar as the mixture will take * Knead
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IGBO ~ Ejike Eze ~ INTRODUCTION Igbo is one of the three major languages of Nigeria‚ the others being Yoruba and Hausa. Native speakers of Igbo‚ estimated to be between 25 and 30 million people‚ reside predominantly in five Eastern states of Nigeria‚ namely Abia‚ Anambra‚ Ebonyi‚ Enugu and Imo. These states are collectively referred to as Alaigbo (Igboland). Native speakers of Igbo are also minorities in two other Eastern States‚ namely Delta and Rivers. The language is also spoken as a second
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Oxidation of the porphyrinogen during the reaction yields the porphyrin .Usually porphyrins are purified by column chromatography often traditional halogenated solvents. However in this green chemistry experiment‚ a safer chromatography solvent mixture (hexanes and ethyl acetate) is used to help with the avoidance of solvent usage‚ the use of solid supported reactions and the use of alternative energy sources. Materials & Methods * 0.43ml of Benzaldehyde 0.30ml of pyrrole * 0
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Introduction Chromatography is a technique used to separate a mixture into its individual components. In this experiment‚ chromatography is done by using a thin layer chromatography (TLC) plate and filter paper. The word ‘chromatography’ itself means the separation of colours. However‚ nowadays‚ both coloured and colourless compound are used in chromatography by various methods. In chromatography‚ the separation process of mixture is mainly based upon the polarity and molecular weight of sample
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obtain a uniform mixture in each cylinder. The various cylinders receive the airgasoline mixture in varying quantities and richness. This problem is called the maldistribution and can be solved by the port injection system by having the same amount of gasoline injected at each intake manifold. By adopting gasoline injection each cylinder can get the same richness of the air-gasoline mixture and the mal-distribution can be avoided to a great extent. 2 Typical pattern of mixture distribution
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amino acids‚ but there are 20 most commonly know amino acids. Amino acids are the fundamenta building blocks of other biomolecules like proteins and ezymes (Davidson‚ 2015). This experiment examined a mixture of 3 amino acids. The purpose of this experiment was to identify amino acids in a mixture through cation exchange chromatography and thin layer chromatography. This was done by examining the amino acids elution order from a cation exchange resin based on their isoelectric points and their different
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Purification of solids Aim: To separate a mixture of carboxylic acid and a neutral substance by treatment with aqueous sodium hydroxide and purifying the carboxylic acid‚ measuring the melting points of the neutral and the acid components. METHOD: A mixture of( 5g) Carboxylic acid and neutral compound were separated by adding 2 mol dm-3 sodium hydroxide (25cm3) to the mixture‚ which separated the water soluble sodium from the water insoluble neutral component‚ by filtration. The solid at the
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benzoin through the condensation of benzaldehyde and thiamine being used as a catalyst. In the second step of the reaction‚ benzoin is oxidized to benzil; nitric acid is used as the oxidizing agent in this step. In the last step of the reaction‚ a mixture of benzil and 1‚3-diphenylacetone undergo a double aldol condensation reaction then a dehydration reaction in order to form tetraphenycyclopentadienone. Experimental: Materials * Thermometer * Round bottom flask (RBF) * Reflux condenser
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