Essay on Chemistry Report

1114 Words Oct 18th, 2014 5 Pages
Experiment 1: Determination of Acidity Number in Fatty Acid OBJECTIVE
To determine the amount of acidity in fatty acid of different types of oil. INTRODUCTION For the experiment, the types of oil we used was canola oil, grape oil and palm oil. These oils are considered as vegetable fats which do not contain cholesterol compared to animal fats. In every oil, there will have fatty acid which is a carboxylic acid with a long chain of even number of carbon atoms. These chains of carbon atoms can be either saturated or unsaturated. Saturated fatty acids have only single bonds. Therefore, each carbon atom consists of two hydrogen atom and thus this fatty acid is saturated with hydrogen bond. Examples of
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On the other hand, the colourless grape seed oil changed to purple colour instead of pink colour. The pink colour of phenolphthalein indicates the solution is neutral. This is because the nature of carboxylic acid is acidity , it will react with sodium hydroxide,Naoh to form salt and water. The volume used to titrate the palmitic oil is the highest , which is 8.2ml(average reading) .The volume used to titrate the grape seed oil is the lowest , which is 2.35ml.

All the result is expressed in palmitic acidity. Palmitic acid is also call hexadecanoic acid in IUPAC nomenclature, is the most common fatty acid (saturated) found in animals, plants and microorganisms. The chemical formula is CH3(CH2)14COOH. As its name indicates, it is a major component of the oil from palm trees (palm oil, palm kernel, and palm kernel oil), but can also be found in meats, cheeses, butter, and dairy products. Palmitate is a term for the salts and esters of palmitic acid. However , different types of oil has different percentage of free fatty acids(FFA) percentage as palmitic acid. We know that the palmitic oil has 43.5% of palmitic saturated C16( a type of fatty acid), canola oil has 4% of palmtic ssaturated C16 and grape seed oil has 7% of palmitic saturated C16. The higher the percentage of palmitic saturated C16, the higher the average FFA% as palmitic acid. Based on the content of palmitic saturated C16 ,the

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