Element Analysis

Unknown #1: Preliminary Identification (20 Points)

You have been given an unknown compound. In the first part of this lab, you will examine the physical properties, solubility, and elemental analysis of the unknown. Fill out the information below as bet as possible. A successful determination of the functional group in your unknown compound is dependent upon the following examinations. You will be graded on how accurate and diligent you perform. At the final step you must predict two potential function group that your compound might contain AND explain your reason for choosing that function group. DO NOT SEPARATE/TEAR THE PAGES OF THE UNKNOWN EXAMINATION!

Unknown Number: 7

1. Physical Properties (5 points):

Solid or Liquid: Solid

Color: Yellow

Ignition Test:

              Flammability: Yellow, sooty flame

              Manner of melting: no residue

              Odor of Gases: no odor

Bellstein Test (testing for halogens): no green flame

Melting Point: 83 oC

Boiling Point:

2. Solubility (5 points):

H2O: Insoluble   5% or 10% NaOH: Insoluble
5% or 10% HCl: Insoluble   5% or 10% NaHCO3: Insoluble
Reactivity with H2SO4: (+) Reaction  

3. Elemental Analysis (Sodium Fusion) (5 points):

Nitrogen: Negative   Bromine: Negative
Chlorine: Negative    

(+): 2,4- DNPH

4. Prediction of functional group present and reasoning why (5 points):



Unknown 1: Final Examination (20 points)

In the second part of the unknown lab you will first isolate which functional group (of the two you predicted) is present. You will then prepare 2 derivatives of your unknown in an attempt to identify the actual unknown compound. Fill out the information below as best as possible. You will be graded on how accurate your answers are for your unknown. At the final step you must identify your unknown compound. DO NOT SEPARATE THE PAGES FOR THE UNKNOWN EXAMINATIONS!

Unknown # 7

1. Narrowing your functional group (5 points). Give the details as to what tests you did to narrow your functional group (including whether it’s 1o, 2o, or 3o as for amines/alcohols)

(-): Chromic Acid

(-) : Iodoform Test

—————————–(5 points)

2. Derivative #1 (5 points):

Reagent used: Phenylhydrazine

Predicted derivative compound: Phenylhydrazone

Predicted derivative compound melting point: 151 oC

Experimental melting point: 147-149 oC

3. Derivative #2 (5 points):

Reagent used: Hydroxylamine chloride

Predicted derivative compound: oxime

Predicted compound melting point: 195 oC

Experimental melting point: 189-192 oC

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