Chromotagraphy

Experiment Number: C1 Title: Food Dyes Date: ordinal January 2012 Introduction: Most heartys in our world atomic number 18 miscellaneas. really 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 outcome and ace or more solutes (dissolved substances) are often consort by chromatography. Chromatography works to separate a mixture because the comp integritynts of a mixture distribute themselves differently when they are in tinge with a two degree system. One human body is unmoving and the other is moving or brisk. The stationary stagecoach may be a solid packed in a tube or a piece of make-up. The mobile phase may be politic of gaseous. Food colourings are one example, a homogeneous mixture of a solving and a item-by-item colour or combination of selected dyes that assert the want colour. (i) Paper Chromatography: This is a modern method utilise to separate mixtures. It uses paper as the stationary phase and liquid event as the mobile phase. Paper chromatography is normally apply 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 bear be dissolved when the solvent touch offs over it. The material cling out move along with the solvent. Each confused in a mixture willing have its avouch characterist ic residuum of attractions to solvent and t! o paper, so all will not move at the same advance. Eventually this disagreement in speed will separate the compounds. In paper chromatography when the conditions are unbroken constant, a particular compound constantly 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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