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Qcs"+5?KXes &6mBPKPpEP P2k*vj^SI@~8n2^,N'<$*"! "----L$$, ? Qcs"+5?KXesqeYND;s4c-Q(?$,"!-- "--$>, ? Qcs"+5?KXes &6mBPKPpEP P2k*vj^SI@~8n2^,N'<$*"! %--& $,PCL5EMS2HP LaserJet 6PLPT1:HP LaserJet 6P???????????e, ? Qcs"+5?KXes &6mBPKPpEP P2k*vj^SI@~8n2^,N'<$*"! "----L$$, ? Qcs"+5?KXesqeYND;s4c-Q(?$,"!-- "--$>, ? Qcs"+5?KXes &6mBPKPpEP P2k*vj^SI@~8n2^,N'<$*"! %--& KkQuill96 Story Group Class9q FMicrosoft Publisher 3.0MSPublisher.39qEmbedded Objects"@BUD@BUDCompObjDVCONTENTS+&CompObjF^CHNKINK  & TEXTTEXTFDPPFDPPFDPCFDPCSTSHSTSHSTSHSTSH<SYIDSYIDZXSGP SGP  INK INK BTEPPLC BTECPLC FONTFONTZSTRSPLC JMCLDMCLD --- "-X--- "-7--A technique used to separate individual substances from a mixture. How simple chromatography apparatus should be set up iis shown to the left. Shown below is the principle in its simplest form Rf (Relative Front) = Distance moved by spot Distance moved by solvent a solution is made using the mixture to be tested, this is loaded onto a strip of absorbent chromatography paper by applying it to a point just above the bottom. It is important to keep the spot as small as possible by applying a drop at a time and allowing each drop to dry before adding the next drop The paper is then suspended so that its end dips into a suitable solvent. The solvent moves up the paper by capillary action taking the substances which were loaded on as it goes. These substances will then separate out at various levels. The places where they end up depends on their solubility in the moving solvent and the ease with which they are absorbed by the paper. It is then possible to identify the individual components, either by comparing their positions on the chromatogram with standard solutions, or by calculating their Rf values. 1 3 2 4 Solvent front Sometimes substances are not separated by one dimensional chromatography. 2 dimensional chromatography can often separate them. Here the same procedure is used to start with. Then after the first  run the paper is turned through 90o and is  run a second time using a different solvent. Set up normally, ensure drops are near the right hand side. 1 After  running the chromatogram rotate through 90o 2 Using a different solvent run the chromatogram again. Substances which had the same solubility in solvent one (and therefore were not separated) have different solubilities in solvent two and are separated by this treatment. 3 Measurement on the spot should be from the highest point, as shown in the diagram. eHow tsshould be set up is x > b $(-vx  : < > "$&(p^B" $  "PS" " "PSS" $    "|$&  "|" $ "  "PS "PS"  A@TSH(A@TSH  "."@@0   "m~rrFȩA@ONT,Times New Roman Serpentine0L#=4S "  """".""P5"` """ " "   """" """" """&"""f"e""" " "   """" """" """""" """" " "   """" """" """""" """" " "   """" """" """"""&"h""" " "   """" """" ""C"4"b""!"H4""" " "   """" """" """"""'"(n""" " "   """" """" """""2""""" " "   "" "" """" """" "'"`"7""" " "   "" "" """" ""-"3"F"J"P"""" " "   "" "" """" ""o"'"":"`"7""" " "   "" "" """" ""]""q"" """" " "   """" """" """""" ;"`""" " "   """""""" """""Q"ps"x""" " "   """""""" """"""M"""" " "   "" """""" """""7"P"Pa""" " "   """""""" """"""P"""" " "   "" """""" ""B"""E"" """ " "   """""""" ""2""C""`"7""" " "   "" """""" """("""$" """ " "   """" """"fferent solvent run the chromatogram again. Substances which had the same solubility in solvent one (and therefore were not separated) have different solubilities in solvent two and are separated by this treatment. 3 Measurement on the spot shouldSummaryInformation(? Oh+'ټ HG  a  f%45C ff(f Uwwwpppppppppppppppppp-4