Chromotagraphy

Experiment Number: C1 Title: Food Dyes Date: ordinal January 2012 Introduction: Most hooeys in our world atomic number 18 miscellaneas. sincerely 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 precede and ace or more solutes (dissolved substances) are often associate by chromatography. Chromatography works to separate a mixture because the comp integritynts of a mixture distribute themselves differently when they are in partake with a two degree system. One material body is unmoving and the other is moving or bustling. The stationary word form may be a solid packed in a tube or a piece of composing. The mobile phase may be semiliquid of gaseous. Food colourings are one example, a homogeneous mixture of a resolve and a undivided colour or combination of selected dyes that arrive the want colour. (i) Paper Chromatography: This is a mo dern method apply to separate mixtures. It uses paper as the stationary phase and liquid solving 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 show be dissolved when the solvent touch offs over it. The material cling out move along with the solvent. Each mingled in a mixture exit have its cause characteristic residuum of attractions to solvent and to paper, so all will not move at the same advance. Eventually this diversity in speed will separate the compounds. In paper chromatography when the conditions are unbroken constant, a particular compound forever 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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