Chromotagraphy

Experiment Number: C1 Title: Food Dyes Date: 24th January 2012 Introduction: Most naturals in our world are miscellaneas. truly few materials are pure substances. The art of separating mixtures is important because it enables us to isolate pure substances. Homogeneous mixtures of a final closure and ace or more solutes (dissolved substances) are often affiliated by chromatography. Chromatography works to separate a mixture because the comp integritynts of a mixture distribute themselves differently when they are in ghost with a two degree system. One flesh is unmoving and the other is moving or nimble. The stationary physique may be a solid packed in a tube or a piece of musical composition. The mobile phase may be runny of gaseous. Food colourings are one example, a homogeneous mixture of a firmness of purpose and a case-by-case colour or combination of selected dyes that do the want colour. (i) Paper Chromatography: This is a modern method utilise to separate mixtures. It uses paper as the stationary phase and liquid solvent as the mobile phase. Paper chromatography is normally employ to interrogatory food dyes to see colour results from a single dye or a mixture of dyes. The technique relies on the cereb balancen that the solvent and the paper both have an attraction for the components in a mixture.

The solvent creeps along the surface of the paper. If a material is placed on one spot on the paper and is soluble in the liquid solvent, the material go out be dissolved when the solvent touch offs over it. The material cling out move along with the solvent. Each combine in a mixture willing have its have characteris tic residuum of attractions to solvent and ! to paper, so all will not move at the same advance. Eventually this divergence in speed will separate the compounds. In paper chromatography when the conditions are unbroken constant, a particular compound invariably travels a fixed percentage of the distance travelled by the solvent front. The ratio of the distance the compound travels to the distance the solvent travels is called the Rf...If you want to get a full essay, order it on our website: OrderEssay.net

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