Experimental Reports Next week is the final week of practicals Make sure you are up to date with your reports by next week – all reports no later than.

Slides:

Advertisements

Similar presentations

Preparation of Salts By SK Chan. Preparing sodium chloride Add NaOH to HCl slowly to get a neutral solution. (How?) Concentrate the solution by evaporation.

Advertisements

Properties and reactions of alcohols. Alcohols are those compounds containing the –OH group. Because alcohols can hydrogen bond with each other, alcohols.

Evaluation preparation

Lecture 11a Esterification. Introduction Esters can be obtained by a broad variety of reactions Acyl chloride Accessibility of SOCl 2 Anhydride Availability.

Preparation of Acetaminophen

Identification of an Unknown Oxygen-Containing Compound

بسم الله الرحمن الرحيم UMM AL-QURQ UNIVERSITY Faculty of Medicine Dep. Of BIOCHEMISTRY.

بسم الله الرحمن الرحيم.  To identify organic compounds from their odors and the colors of their reaction products.

Organic Chemistry Lab II, Spring 2010

Bromobutane. Halogenoalkanes Halogenoalkanes are hydrocarbon chains that have one or more hydrogen atom(s) exchanged for halogen atom(s).

A student dissolves 3g of impure potassium hydroxide in water and makes the solution up to 250cm3. The student then takes 25.0cm3 of this solution and.

Synthesis of Dibenzalacetone

Extractions Mixture of benzoic acid, anthracene, and p-nitroaniline.

MILK. 1) Adultration of milk 1) Adultration of milk Objectives: To detect any adulteration of milk. Introduction and principle: One of the most common.

Exercise F2 Recrystallization and Vacuum Filtration Organic Chemistry Lab I Fall 2009 Dr. Milkevitch September 21 & 23, 2009.

SURVEY OF CHEMISTRY LABORATORY I

Recrystallization Impure benzoic acid

The Aldol Condensation Puzzle

RECRYSTALLIZATION.

SYNTHESIS OF p-METHYLACETANILIDE

Preparation of Diphenylmethanol by Reduction of Benzophenone

Experiment 5 Synthesis of an Iron Oxalate Compound Chemistry Department UCC1 st Year Practicals.

Experiment 14 Preparation of Acetylsalicylic Acid.

Today: Wrap up Exp. 1: “Melting Points” Introduction to Exp. 2: “Recrystallization” (2 Lab periods) In Lab: Today: 2ab. Next week: 2c and completion of.

Experimental Reports Today is the final practical

Lab 42- Analysis of asprin. Part 1  Neutralize all the asprin, and additonal acidic impurities.

ESTERS: SYNTHESIS AND FRAGRANCE

Standardisation of potassium permanganate solution Ex 5

Marble is just CaCO3 Gravimetric Determination of Ca

Experiment 21: ESTERS: SYNTHESIS AND FRAGRANCE Objectives:  To synthesize an ester from acetic acid with isoamyl alcohol under reflux.  To purify your.

Synthesis of Lidocaine (Step 2)

Redox Titration Part 1: To determine the percentage of H 2 O 2 in aqueous solution Part 2: To determine the percentage of ascorbic acid in vitamin C Handout.

Recrystallization Lab # 2.

Solutions & Solubility

Organic Qualitative Analysis Determination of functional groups present in an unknown organic compound by their characteristic chemical reactions. You.

Reduction of carbonyl compounds

Solution Chemistry Test Review Work Stations. Station 1 – Solubility Concepts 1.Identify the three factors that affect the rate of solution formation.

Chemical tests to identify anions

Mixture of benzoic acid, anthracene, and p-nitroaniline Extractions.

Lecture 4c Extraction.

Experiment 8. Thermodynamics of the Dissolution of Borax

Concentration  A measure of how much solute is dispersed throughout the solvent  Molarity (M), molality (m), and mole fraction ( χ ), mass percent.

Phase Two Titration Year 10 EEI by Mr H Graham Volumetric analysis is; A type of chemical analysis which depends on the accurate measurement of solution.

Overview Several complexes of Cu 2+, Ni 2+, and Co 2+ are formed and studied. The observations of color change that result from the addition of a ligand.

Preparation of an ester

Identification of Compounds

NaBH4 Reduction of p-Vanillin

Solutions & Solubility Solution Preparation. Solution Preparation from a solid  Standard Solution = a solution for which the precise concentration is.

Dehydration of 2-methylcyclohexanol -- an E 1 reaction.

Extractions Mixture of benzoic acid, anthracene, and p-nitroaniline.

Making Salts Insoluble salts – precipitation Mix two solutions together one with the cation, one with the anion. Filter, wash and dry. Soluble Na +, K.

Stoichiometry: Quantitative Information About Chemical Reactions Chapter 4.

Preparation of Acetanilide

Lab 24Date: Acids, Bases and Indicators…oh my! Purpose Background Observe a neutralization rxn & work with indicators. Bases will turn red litmus blue.

Separation of Casein.

Trinity College Dublin, The University of Dublin Titration Demonstration.

Experiment Five Synthesis and purification of the analgesic agent, Acetaminophen (Paracetamol)

Law ManWai(09) Lai MeiLing(28) Mo WanI(32)

Chemistry Project Lau Ching Fai(8) Tze Chi Ho(21)

26 Cannizzaro Reaction The disproportionation reaction of aldehydes without α-hydrogens in presence of a strong base to produce an alcohol and a carboxylic.

Preparation of Methyl Benzoate

Lab 9: Determining the Concentration of Acetic Acid in Vinegar

Lab Activity 3 Formation of Osazones (Phenyl Hydrazine Reaction)

Extractions Mixture of benzoic acid, anthracene, and p-nitroaniline.

Exp. Iron in Vitamin Tablet

Recrystallization Impure benzoic acid

Standardization The Titration.

What amount of heat is required to increase the temperature of 75

Recrystallization Impure benzoic acid

Presentation transcript:

Experimental Reports Next week is the final week of practicals Make sure you are up to date with your reports by next week – all reports no later than one week Final reports must be handed up no later than one week after completion of final practical – otherwise marks will be forfeited

Experiment 17 Reactions of Alcohols and Carboxylic Acids

Introduction Given samples of various alcohols and carboxylic acids Establish some of their physical and chemical properties & perform various reactions

Introduction You will perform solubility and acidity tests on all the compounds provided Ester formation from an alcohol and carboxylic acid Oxidation of an alcohol to a carboxylic acid using permanganate solution

Solubility Tests To 1ml of water in three test tubes, add each of the alcohols dropwise until they cease to dissolve or until 10 drops have been added Record your observations Repeat with the two carboxylic acids Comment on your conclusions regarding the solubilities in water

Acidity Tests Use the aqueous solutions of ethanol and ethanoic acid from the solubility tests Test both with blue litmus paper Add 1ml of 10% NaHCO 3 to each Record your observations in each case

Acidity Tests Dissolve 0.5g of sodium acetate in 5ml water – note if there is any odour Add 1ml dilute H 2 SO 4 and again note if there is any odour Record your observations in each test and explain any reactions observed

Ester Formation Already encountered in Experiment 14 Heat 2ml of ethanol, 1ml ethanoic acid and a few drops of conc H 2 SO 4 for 5 mins Note any changes you observe – odour?

Ester Formation - Mechanism Include mechanism for ester formation in your report

Oxidation of Phenylmethanol Phenylmethanol (benzyl alcohol) can be oxidized to give benzoic acid To 1ml of phenylmethanol in a conical flask add 25ml of KMnO 4 solution and 0.5g of sodium carbonate Heat on the water bath for 20 mins Cool & acidify with conc HCl

Oxidation of Phenylmethanol Add sodium sulphite solution until the brown maganese dioxide dissolves Cool to room temperature – white precipitate of benzoic acid settles out

Oxidation of Phenylmethanol Isolate crystals on the Hirsch funnel, wash with water & dry Get melting point when dry Calculate % yield from number of moles of phenylmethanol you began with

Calculations Density of phenylmethanol = 1.05 gml -1 Use the density & volume to calculate the mass of phenylmethanol used

Calculations Use the mass of phenylmethanol to calculate the number of moles When dry, weigh the benzoic acid product and thus calculate the number of moles of product % yield = moles benzoic acid/moles phenylmethanol

Report Introduction All observations from the solubility and acidity tests & reactions Mechanism for ester formation Weight and melting point % yield of benzoic acid Discussion & conclusions