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External link to Quantative analysis of caffeine content
Chemistry

Quantative analysis of caffeine content

Caffeine was extracted from decaffeinated coffee and normal tea using DCM as the solvent and compared with prepared solutions of caffeine using reverse phase HPLC. The experimentally determined result was a caffeine concentration of 7.598?g/ml for decaffeinated coffee compared with 5.9?g/ml reference and 0.4049mg/ml for tea against 0.26mg/ml[1]*. Introduction Caffeine (1) is the most commonly consumed non-prescription stimulant. It is a member of the xanthine […]

External link to The forensic science
Chemistry

The forensic science

Introduction of title The terms of “forensic science” cover those professions which are involved in the application of social and physical science to the criminal justice system. Forensic experts are expected to find out the details of method used, to substantiate the choice of the applied technique and to give their unbiased conclusions. Therefore, the methods applied in forensic laboratories should assure a very high […]

External link to Manufacture of microcapsules
Chemistry

Manufacture of microcapsules

Abstract The following report is a summary of literature reviewed for the manufacture of microcapsules. More specifically the main focus of the review is the preparation of polyelectrolyte microcapsules by the Layer-by-Layer method of manufacture. This method involves the consecutive coating of by oppositely charged polyelectrolyte species onto a core template, which is then dissolved to give a hollow microcapsule. This method provides microcapsules with […]

External link to The element copper
Chemistry

The element copper

Introduction Copper, elemental symbol Cu, is a transition d-block metal, and is the least reactive of the first row metals. Copper can have the oxidation states +1 and +2 and can form many complexes with various ligands. The Cu 2+ ion, at low concentrations, is an essential element to plant and animal life, and a human adult has a required daily intake of 3-5mg. [1] […]

External link to The substitution reactions
Chemistry

The substitution reactions

Acknowledgement The preparation of this project on the topic-” substitution reactions.”: a profile’ would not have been possible without the valuable contribution of my TEACHERS. I would like to give most specially thanks to my CHE sir Dr. Ashish kumar who is my chemistry teacher to giving me the important guidelines during making this project. So, I hope this project will provide large and sufficient […]

External link to Electrochemical battery
Chemistry

Electrochemical battery

HISTORY An early form of electrochemical battery called the Baghdad Battery may have been used in antiquity. However, the modern development of batteries started with the Voltaic pile, invented by the Italian physicist Alessandro Volta in 1800. In 1780 the Italian anatomist and physiologist Luigi Galvani noticed that dissected frog’s legs would twitch when struck by a spark from a Leyden jar, an external source […]

External link to Using Spectrophotometer to measure the concentration of compounds
Chemistry

Using Spectrophotometer to measure the concentration of compounds

The spectrophotometer can measure the intensity of light absorbed indirectly by the solutes in solution because each solution has its own characteristic absorption chattels. The spectrophotometer can be used to measure the concentration of compounds in a certain solution. Differentiating compounds is another uses of spectrophotometer .It works by analyzing the pattern of wavelengths absorbed by the sample.. The absorbance can be calculated using: Beer-Lambert […]

External link to Antibiotic
Chemistry

Antibiotic

INTRODUCTION The term “antibiotic” was put forward by Vuillemin in 1889, to designate the active component involved in the process of ‘antibiosis’ or to the opposition of one living micro-organism to another . According to another school of thought – ‘antibiotics are nothing but the microbial metabolites which in relatively high dilution may inhibit the growth of micro-organisms’ . Waksman proposed the widely cited definition […]

External link to Recrystallising acetanilide
Chemistry

Recrystallising acetanilide

The aim of this experiment is to establish the most suitable solvent required for recrystallising acetanilide, and to exhibit the methods of vacuum filtration and recrystallisation. Experimental Method (for selection of a suitable solvent): Four solvents: dichloromethane, methylated sprits, petroleum ether and water were tested to see how appropriate they were for recrystallising acetanilide. Impure acetanilide (0.1g) was inserted into a small test tube and […]

External link to Acid rain
Chemistry

Acid rain

An introduction to the Acid rain Acid rain is a major problem for our health and even our existence. Human started poisoning the atmosphere with acid gases since 1730, at the height of the Industrial Revolution. Although, it was first recognized in 1872, approximately one hundred years after the beginning of the Industrial Revolution, when an English scientist, Robert Angus Smith (1817-1884), pointed out the […]

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