complexing agent) | Green Gel becomes crystalline upon standing‚ Ni(OH)2 | ? | S2- (acidic pH = 0) | Black ppt‚ Ag2S(soluble in hot 6M HNO3) | Black ppt‚ PbS(soluble in hot 6M HNO3) | Black ppt‚ CuS(soluble in hot 6M HNO3) | No ppt | | S2- (basic pH = 9) | Black ppt‚ Ag2S(soluble in hot 6M HNO3) | Black ppt‚ PbS(soluble in hot 6M HNO3) | Black ppt‚ CuS(soluble in hot 6M HNO3) | Black ppt‚ NiS(soluble in hot 12M HCl) | | Perform the Separation/Identification Experiment as follows; • Read through the
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device for the acid-gas sensitive test. The bottle held concentrated HNO3 acid up to its 1/3 volume. The sample was cast on a glass and then set on the bottleneck to fully cover the sample. Concentrated HNO3 is a volatile acid‚ and liquid HNO3 can easily vaporize. As expected‚ RH-PY is highly sensitive to gaseous HNO3. As shown in Figure 1(B)‚ the absorption of initial sample is centered at 350 nm. Upon exposure to fuming concentrated HNO3 vapor‚ a new peak centered at 570 nm began to appear. This peak
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Isolation and Characterization of Complex Lipids Shea Kathleen Guinto‚ Peter Julius Dale Inocando*‚ SooHyun Jung‚ Jurilla Camille Louise Department of Biology‚ University of Santo Tomas‚ Manila‚ Philippines Abstract In this experiment an egg yolk will serve as the sample to isolate lipids and separate them into two classes which is the phosphorylated lipid and the non-phosphorylated lipid. The isolated lipids are then characterized through a series of color chemical tests along with the given
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|33 |[Ar]3d104s24p3 | |Sb |51 |[Kr]4d105s25p3 | |Bi |83 |[Xe]4f 145d106s26p3 | General introduction‚ electronic configuration‚ occurrence‚ oxidation states‚ trends in physical and chemical properties; nitrogen - preparation‚ properties and uses; compounds of nitrogen: preparation and properties of ammonia and nitric acid‚ oxides of nitrogen (structure only); Phosphorous-allotropic forms; compounds
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Experiment 3: Enthalpy of Various Reactions Introduction A coffee cup calorimeter is an apparatus that is used to measure the quantity of thermal energy gained or lost in a chemical reaction. This experiment utilizes this apparatus‚ which is made from two styrofoam cups with plastic lids and a thermometer‚ to measure changes in thermal energy of various reactions. When using this type of apparatus‚ it is assumed that no heat is transferred between the calorimeter and the surroundings‚ and that
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precipitate. Add 1 drop of Dimethylglyoxime. Discard. Dilute to 1 ml and divide into 3. Boil solution and add 6M NH3 until slightly basic to litmus. Decantate Centrifuge and separate. Precipitate Discard. Add 1 drop of 16M HNO3 and heat in water bath for 5 mins. Wash with 4 drops of 1M HCl. Add 3 drops 12M HCl. Precipitate Decantate Centrifuge and separate. Let stand for 1 min. Acidify with 6M HOAc and add several KNO2 crystals Acidify with 1 M HCl
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The purpose of this experiment is to observe the qualitative aspects of a series of reactions involving copper. Procedure 1.Measure about 1g of solid copper. 2.Place Cu in Erlenmeyer flask and place flask under fume hood. 3.Add dropwise 15M HNO3 until solid copper is completely reacted. 4.Place flask in water bath. 5.Add 4M NaOH slowly until no more solid forms. 6.Mix contents by slowly swirling flask. 7.Place flask back in water bath‚ heat to boiling‚ and stir. 8.Heat until separation
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lab is to discover what happens when someone executes a series of procedures‚ beginning with copper metal. What is done | What is observed | 1. Started with copper‚ Cu (s). | reddish‚ brownish‚ orange-ish‚ powder-like | 2. Added nitric acid‚ HNO3 (aq). | acid turns blue and smells like chlorine. | 3. Added water‚ H2O (l). | stayed the same | 4. Added sodium hydroxide‚ NaOH (aq). | changed consistency‚ gel-like | 5. Heated the mixture | becomes darker‚ dark-brown-like‚ shavings |
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determine a value for the equilibrium constant for the reaction between iron (III) nitrate and potassium thiocyanate. Equipment/Materials: Spec 20 or similar spectrophotometer 0.00200 M KSCN 0.200 M Fe(NO3)3 0.00200 M Fe(NO3)3 0.05 M HNO3 burets or pipets 50 mL beakers cuvets Safety: • An apron and goggles should always be worn in the lab. Procedure: 1. The chart below provides the volumes of reactants needed to prepare the standard solutions. Notice that the
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Organic chemistry studies carbon compounds‚ but a few carbon compounds such as carbon monoxide‚ carbon dioxide‚ metal carbonates‚ and carbon disulphide traditionally come under the umbrella of inorganic chemistry. INTRODUCTORY 1. Give the following for the compound propane C3H8: (a) Full structural formula (b) Skeletal formula 2. Draw all the possible isomers of hexane C6H14 and give the name of each. 3. Draw the structural formulae for each of the following alkanes: (a) 2‚2- dimethylbutane
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