• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Qualitative Tests - Organic

Extracts from this document...


Sumeet Riar Qualitative Tests Organic AIM: Identify compound E and F (A) METHOD Transfer one quarter of E to an inverted crucible lid. Heat it gently from below to dry it, when white fumes begin to evolve ignite it from above. OBSERVATION The white fumes evolved in less then 1 minute of heating. When ignited a large flame arose. When flame was blown out initially black liquid formed followed by residue of soot around the lid. Once settled very small crystals could be observed. INFERENCE An aromatic compound or very highly saturated, also could be aliphatic. (B) METHOD Heat a little of E with water then filter if needed, separate the solution into two portions (i) ...read more.


A heated smell observed when sulphuric acid added. Some heat evolved and small crystals formed on heating After cooling the mixture effervescence was observed and a yellowish colour was observed INFERENCE Carboxylic group maybe present because when methanol and sulphuric acid react together an ester was formed. Carbon dioxide may been given of when sodium carbonate was added, according to the following reaction: CO32- + 2H+ --> CO2 + H2O (D) METHOD Place some of sample F on a inverted crucible lid and ignite it from above OBSERVATION No flame. Where ignited the powder turned yellow-brown colour INFERENCE Halogenated compound or hydroxo acid (E) METHOD Dissolve sample of F in 10cm3 of distilled water (i) ...read more.


To 2cm3 of the solution of F, add aqueous silver nitrate. Then add 1 cm3 of dilute nitric acid> Finally add an excess of aqueous ammonia OBSERVATION (i) F dissolves fully in water. The mixture turns slightly milky when sodium hydroxide is added. The mixture then becomes clear again when adding Hydrochloric acid (ii) No change observed initially however, the tube heated on adding hydrochloric acid to approximately 220C. When 2-naphtol added thick reddish, precipitate is formed. (iii) White precipitate formed on adding silver nitrate. The white precipitate remains after adding dilute nitric acid. The precipitate dissolved on adding aqueous ammonia. INFERENCE (i) Cannot be a phenol. Maybe a basic amine (ii) Nitrous is formed in situ. (Azo dye formed) or aromatic primary amine (iii) Cl - ion E - Phenol derivative F- aromatic primary amine with Cl attached to the benzene (Benzonediazonium chloride) ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. How much Iron (II) in 100 grams of Spinach Oleracea?

    Using a balance accurately weigh out 20 grams of Spinach Oleracea. 2) Using scissors cut the leaf into small equal sized pieces and transfer it to a 250 cm3 beaker. 3) Using a 50 cm3 measuring cylinder measure out 50 cm3 of distilled water (l)

  2. Identification of an unknown organic compound

    * Metals produce hydrogen * Alkali's and basic metal oxides produce water * Carbonates produce carbon dioxide and water The test I will be using to identify a carboxylic acid will be using a bi-carbonate. I will mix a few drops of the substance with about 2-3cm of water.

  1. the synthesis of azo dyes, aspirin and soap

    The three molecules of H2O are released to form the ester as seen in the picture above. Below is another fat and another diagram of a triglyceride that has three tails. Each tails forms a different fatty acid. http://members.aol.com/jitsm/sas/Lowry_Paper/triglyceride3.gif Second Step: Hydrolysis = Saponification A hydrolysis reaction is the

  2. Identification of an Organic Unknown.

    Handle glass equipment with care for example put the test tube in the test tube rack. Be careful when disposing organic materials ensure there is an organic waste beaker or bucket available. If any chemicals are ingested, contact the teacher without delay. Note down all observations occurring for each test.

  1. Organic compound identification.

    Heat the mixture until it just boils and account for any colour change. What can you conclude about the functional group in C from the results of tests 1 and 2? Give the name and structural formula of Compound C.

  2. Identification of an organic unknown.

    I will begin with the carbonyl group. In the carbonyl group, I have three possible functional groups that the organic unknown can be: an aldehyde, a ketone or an ester. The odd one out is obviously ester and so there is probably a test that can identify an aldehyde and a ketone from an ester.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work