Method:Part of wintergreen,sodium hydroxide ect.You will be making around

Method:Part 1-Before starting this section you should make sure any hair or a headscarf is tied back.You Should also be wearing goggles as you are using harmful chemicals which could potentially harm your eyes or skin.You should be wearing a lab coat to make sure the chemicals you are using are not being contaminated with the clothing you are wearing.Make sure when using substances which cause irritation to the skin you are wearing gloves to stop your skin being irritated or harmed in anyway.Set up the reflux apparatus e.g:condenser,,beakers,oil of wintergreen,sodium hydroxide ect.You will be making around 30cm3 of the reaction mixture.Make sure the gas for the bunsen burner is being turned on when in use as it could realise harmful gases in the atmosphere which could affect you as well as anyone around.Make sure all the glass is being handled with care.Make sure the gauze is in the centre of the tripod so that it does not set anything on fire.Make sure the condenser prevents any vapours escaping).You will also need to set up a water bath,then put the oil of wintergreen with the aqueous sodium hydroxide,using a water bath. You will then have the solution in a smaller beaker.Make sure when.Maken sure when using the oil of wintergreen you are careful as it has many risks associated with it as it is : hazardous in case of skin contact (irritant), of eye contact (irritant), of ingestion, of inhalation.Therefore you should be wearing gloves to stop your skin from being irritated.1Make sure you check the temperature of the water bath regularly because if the temperature is too high the solution inside could evaporate and it by it also being too hot the falsk could smash. When using Sodium Hydroxide you should also be careful as there are risks associated with it too as it is corrosive, may cause burns, harmful by ingestion, skin contact or by inhalation of dust.2Put 2g of oil of wintergreen into your flask and add 25cm3 of 2 mol dm-3 sodium hydroxide along with some anti-bumping granules ,this will help heat at a steady paste when heating your solution up.Make sure you add these before the reaction mixture is heated as it helps when heating.Then heat over the boiling bath for 30 minutes as it needs alot of energy so the reaction is complete.Make sure you never use a bunsen burner as the reactants which are being used are highly flammable.Allow to cool.Pour the mixture into a small beaker surrounded by the mixture of ice and water.Then add hydrochloric acid.The mixture must be cooled when doing this as it could be too vigorous.Add concentrated hydrochloric acid to the mixture dropwise until it is acidic when stirring.Make sure you check the pH with litmus paper by removing a small amount of a mixture and adding universal indicator.Make sure when using concentrated hydrochloric acid you are careful as it is corrosive and irritant and it causes burns. The vapour irritates the lungs.It may irritate the eyes and skin. 3Fitler the product using a buchner funnel and suction apparatus.Make sure you allow the liquid to be sucked through the funnel.Your salicylic acid must be dry for you to do the next step.4Part 2Before starting this section you should make sure any hair or a headscarf is tied back.You Should also be wearing goggles as you are using harmful chemicals which could potentially harm your eyes or skin.You should be wearing a lab coat to make sure the chemicals you are using are not being contaminated with the clothing you are wearing.For this section especially you should also be wearing gloves,as this will protect your hand from being irritated with any of the substances and you will also have to use the fume cupboard.Firstly using the weighing scale weigh out approximately 6.00g of salicylic acid directly into a 100cm3 conical flask.Salicylic acid is an unpleasant substance to be working with and there are hazards associated with it if your skin becomes incontact with it ,this should therefore be avoided. Record the mass of salicylic acid used as you will need this later on in your experiment. Using a 10 cm3 measuring cylinder, add 10 cm3 of ethanoic anhydride to the flask and swirl the contents.Make sure when swring you do it gently and not vigorously as the contents inside the flask could be split and this could ruin your experiment as well as causing harm to you.Ethanoic anhydride when using it in a lab you must be supervised with an adult as well as when measuring it you should be using a fume cupboard.As inhalation can cause Cough. Laboured breathing. Shortness of breath. Sore throat.Also you should be wearing gloves as it can cause irritation to your skin redness. skin burns. Pain. Blisters. Effects could be delayed. 5 Then add 5 drops of concentrated sulfuric acid to the flask and swirl the mixture in the flask for a few minutes to ensure thorough mixing.When using concentrated sulphuric acid make sure you are careful as there are many hazards associated when using it for example it is corrosive to the skin as well as causing redness and pain if in contact,it can also do the same to your eyes if in contact.Therefore when using substances make sure you are wearing gloves and goggles at all times to protect yourself from these dangerous substances.6Warm the flask for twenty minutes in a 400cm3 beaker of hot water at approximately 60°C ,the temperature in the flask should not be allowed to rise above 65°C as will affect your asprin becoming pure.Therefore when it gets too hot add a little bit of cold water or remove it therefore it should stay constant for a while and vice versa. Allow the flask to cool and pour its contents into 75cm3 of water in a beaker, stirring well to precipitate the solid.If your contents do not turn into a precipitate and dissolve instead make sure you put it into an ice bath and and scratch using a glass rod or spaulta and your precipitate should form. Filter off the aspirin under reduced pressure, avoiding skin contact.When filtering in a lab make sure you use thin filter paper as your crystals will come out better.The best method to filter with when in a lab is using a buchner funnel as any excess water will all come out leaving you with the best results. Collect the crude aspirin on a double thickness of filter paper and allow it to dry. Part 3Before starting this section you should make sure any hair or a headscarf is tied back.You Should also be wearing goggles as you are using harmful chemicals which could potentially harm your eyes or skin.You should be wearing a lab coat to make sure the chemicals you are using are not being contaminated with the clothing you are wearing.Using a 25cm3 measuring cylinder, measure out 15 cm3 of ethanol into a boiling tube.Make sure when using ethanol it is not near any naked flames or anything which will catch on fire as ethanol is highly flammable.Prepare a beaker half-filled with hot water at a temperature of approximately 75°C. The safest way to do this is to use a kettle of boiling water and add water from the kettle to cold water in the beaker until the temperature is at approximately 75°C. The boiling point of ethanol is 78°C and the temperature of the water in the beaker should not be allowed to go above this. Then use a spatula to add the crude aspirin to the boiling tube and place the tube in the beaker of hot water.Stir the contents of the boiling tube until all of the aspirin dissolves into the ethanol.Pour the hot solution containing dissolved aspirin into approximately 40cm3 of water in a 100 cm3 conical flask. If the solid does separates at this stage, let the contents in the water bath until solution is complete. You should avoid prolonged heating, since this will decompose the aspirin.10Allow the conical flask to cool slowly and white needles of aspirin should separate.10If no crystals have formed after the solution has cooled to room temperature, you may need to use an ice bath and to scratch the insides of the flask with a glass stirring rod to obtain crystals.Filter off the purified solid under reduced pressure and allow it to dry on filter paper.Record the mass of the dry purified solid.Part 4- Purification 7Before starting this section you should make sure any hair or a headscarf is tied back.You Should also be wearing goggles as you are using harmful chemicals which could potentially harm your eyes or skin.You should be wearing a lab coat to make sure the chemicals you are using are not being contaminated with the clothing you are wearingIf you do not have sealed melting point tubes, heat the end of a capillary tube in a Bunsen burner flame until the glass softens and the end is sealed. Do not heat the tube so strongly that it bends. Leave it on a heatproof mat to cool.. Make sure that your samples of solid are dry, by leaving them in a desiccator or an oven at 50 °C overnight. Fill the melting point tube to a depth of about 0.5 cm with dry impure aspirin.Seal a second tube and fill it to a depth of about 0.5 cm with dry crystals of purified aspirin.Place each tube in the melting point apparatus, slowly increase the temperature and note the temperature range over which the substances melt. (Record the melting point ranges of the pure and impure samples and include a description of the melting process in each case)Graph