The catalyst is usually concentrated sulphuric acid.

A possible method of synthesis Carefully add 10 mL of acetic anhydride and 0.2 mL of concentrated sulfuric acid to catalyze the reaction (some heat Synthesis of Methyl Salicylate from Aspirin -…condensation reaction between an alcohol and an acid, typically in the presence of a strong acid catalyst, such as sulfuric acid.

US2184707A - Pressure synthesis of sulphuric acid - …

The Contact Process for the manufacture of sulphuric acid

Synthesis of Aspirin- Why Sulphuric Acid? | Yahoo …

Firstly, 11ml of 30% Hydrogen Peroxide is pipetted into 10ml of Acetone in a small 100ml conical flask. A beaker can be used but I chose to use a small conical flask to reduce acetone evaporating. This was then cooled in a salt ice bath until the temperature was around 5C. Secondly, 2ml of Sulphuric Acid was added. (It is recommended to cool the acid before adding to reduce temperature rise.) This is a critical step. The acid has to be added slowly drop wise. Do Not let the temperature rise to over 10C, otherwise there will be formation of the unstable dicyclo iosmer. Temperature is held between 0 - 10C. Constantly stir solution. It's alright if the solution is yellowish. When all acid is in, the solution is stirred for another few minutes. You will see that white precipitate starts to form already. Another plus point for the conical flask is that it's easier to mix by shaking.

Synthesis of Aspirin- Why Sulphuric Acid? | Yahoo Answers

coal, petroleum) releases sulphur dioxide into the atmosphere
This reacts with hydroxyl radicals (neutral form on the hydroxide ion) in the atmosphere to create sulphur trioxide
Sulphur trioxode reacts with water droplets in the atmosphere to form sulphuric acid - which results in acid rain Why is it harmful?

The sulphuric acid is not used in the reaction, it is just used as an acid catalyst of the esterification process.

Is the acid consumed during the synthesis

3.0 g salicylic acid; 6 mL acetic anhydride*; 5-8 drops of 85% phosphoric acid or concentrated sulfuric acid*; Distilled water (about 50 mL); 10 mL ethanol; 1% iron III chloride (optional, to test purity).

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7) shows what would happen if strong or concentrated sulfuric acid were used instead of dilute HCl.Synthesis of Oil of Wintergreen – Cornell Center for…1 Aug 2007 Esterification reaction- carboxylic acid reacts with an alcohol in the presence of sulfuric Students will determine the purpose of sulfuric acid in the .

The slightly positive hydrogen atom in the sulphuric acid acts as an electrophile, and is strongly attracted to the electrons in the pi bond.

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While over 50% of sulphuric acid is used in the manufacture of phosphate fertilisers, the rest of the market (industrial applications) has a vast array of uses across multiple industries which is set to drive ongoing demand. An overview of sulphuric acid industrial applications is shown at Table 9 on the previous page.

You get a similar 'speeding up' effect when copper(II) sulfate solution is added to a -dilute sulfuric acid mixture.

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In the first step, the ethanoic acid takes a proton (a hydrogen ion) from the concentrated sulphuric acid. The proton becomes attached to one of the lone pairs on the oxygen which is double-bonded to the carbon.

Now a days, sulphuric acid is prepared by contact process all over the world

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Mistry Instructor: Renan Gongora Lab Title: Aspirin Introduction Figure 1: buy viagra new york Reaction scheme for synthesis of aspirin with 1 drop of sulfuric acid added.