Presentation on theme: "Qualitative detection of"— Presentation transcript:
1 Qualitative detection of Laboratory Work №1Qualitative detection ofcarbon,hydrogen,chlorinein organic compounds
2 PROCEDURE1. Put copper (II) oxide and paraffin into the test tube, then heat it carefully until paraffin melts and shake the test tube.2. Place the test tube into the laboratory iron stand and add some copper (II) sulfate3. Close the test tube by a bent delivery test tube the other end of which is dipping into lime water contained in flame.
3 Laboratory equipment Icon ring test tube beaker Volumetric flask Laboratory iron standEvaporating dishAlcohol burner
4 Experiment №1. Qualitative detection of carbon in organic compounds CuO, paraffineCO2CuCuSO45H2OCa(OH)2 + CO2 ->-> CaCO3 + H2OCaCO3Ca(OH)2
5 Experiment №2. Qualitative detection of hydrogen in organic compounds CuSO4+ 5 H2O -> CuSO4 * 5 H2OCuCuOH2OParaffinC23H CuO -> 70Cu + 23CO2 + 24H2OWhen mixture of paraffin and copper (II) oxide is heated alkanes are oxidized to carbon dioxide and water. Water forms hydrate with copper (II) sulfate which has blue color. Copper (II) oxide is reduced to red copper.So in paraffin hydrogen exists.
6 Experiment: Qualitative detection of carbon and hydrogen in organic compounds CuSO H2O -> CuSO4 * 5 H2OCuO, paraffinCuCO2CuSO45H2OCa(OH)2 + CO2 ->-> CaCO3 + H2OCaCO3Ca(OH)2C23H CuO -> 70Cu + 23CO2 + 24H2O
7 Your observationsCopper (II) oxide reduced to copper, so we observe change in color from black to red.C23H CuO -> 23 CO2 + 24H2O + 70 CuColorless copper (II) sulfate changed its color to blue because of formation of copper (II) sulfate pentahydrate.CuSO4 + 5H2O -> CuSO4 * 5H2OCarbon dioxide formed as a result of reaction gives precipitate of the carbonate by passing into limewater solution.Ca(OH)2 + CO2 -> CaCO3 + H2O
8 Experiment № 3. Detection of carbon in sugar (sucrose) by carbonization testPut some amount of sugar into an evaporation dish . Then heat it.Sugar carbonized.H2OSugar carbonizes i.e. carbon as pure element coke is producedtC12H22O > 12 C H2O
9 Experiment №4. Qualitative detection of chlorine in organic compounds – Beilstein test Heat a copper wire in a bunsen flame until the color is non-luminous
10 Insert the copper wire into the organic solid substance to be analyzed
11 Heat the copper wire again. Copper forms copper (II) chloride and the flame will take the characteristic green blue color.
12 Test № 1 Put correct words instead of dots. SO2CHOCO2oxygenreducing agentBlue vitrolCOClcoppermalaxiteoxidizing agent1. Lime water forms precipitate when …….. passes through the solution2. Formation of precipitate proves the existence of ……3. In the reaction copper (II) oxide - …………4. …. is formed from copper (II) oxide5. Unaqueous copper (II) sulfate becomes blue because ……………
13 Test № 2 Put correct word instead of dots hydrationC8H18dehydrationhydrogenationC23H48C23H46HOSClCCCl4CHCl3CH4Cu1. The color of copper (II) sulfate changes as a result of ………..2. Molecular formula of paraffin …….3. Formation of CuSO4* 5H2O proves existence of …4. The formula of tetrachloromethane …….5. The flame assumes the green – blue color because of the presence ….