|Many foods such as ice cream, candy, syrup and
others contain artificial flavours. many of these flavouring additives are
esters. An ester is an organic compound that is produced by the dehydration
of a water molecule from between a carboxylic acid and an alcohol.
Example ester possibilities.
2. Prepare a distillation flask with 5 mL of any alcohol available. Record the alcohol used along with any other information available on the bottle such as formula and molecular mass.
3. From the available carboxylic acids use either 5 mL or 3 grams and add to the alcohol in the distillation flask. Record the formula and molecular mass if available. If not available you will have to look it up in one of the data books.
4. Carefully add 2 mL of conc. sulphuric acid to the distillation flask. Swirl to mix the contents as evenly as possible. Place the distillation flask into the water bath and warm. (Optional: The use of a condensation tube for reflux purposes will greatly improve your results.)
5. Carefully note any changes in the distillation flask.
6. After about 10 minutes of warming remove the distillation flask and allow it to cool until it is safe to smell. Use caution and smell carefully. If there is no detectable odour then return the flask to the water bath for an addition 5 minutes. Once an odour is detected ask the teacher to decide if the reaction is complete.
7. Neutralize the acidic contents with a alkali until neutrality is reached to litmus.
8. After neutrality check for a detectable odour again.
Available Carboxylic Acids:
Carboxylic acid used:
1. Write the complete balanced reaction equation for each combination
that you created.
2. Calculate the amount of predicted product ester you should
have made from your starting materials.