LAB1 Organic Chemistry 201 - Organic Chemistry 201 Lab #1...

Organic Chemistry 201
Lab #1
Effect of pH on a Food Preservative
Measuring the Density of Unknown Liquid
From: Abubaker Khalafalla
Pearson Number: 50159065
TA: Lucia Nitsch
Date of submission: 06/09/2016

Abstract:
There are two main objectives of this experiment, the first one is to place sodium
benzoate into a medium that will simulate stomach acid which is an aqueous hydrochloric acid
solution with a pH range of 1-3 to determine is the sodium benzoate is chemically stable in the
stomach and whether or not it is going to react with acid in the stomach, the second objective of
this experiment is to measure the density of an unknown liquid.
Introduction :
Sodium benzoates are widely used in the food preservative companies as it used in fruit
products, jams, relishes, beverages dressings, salads, pies, ...etc that is due to its higher solubility
in water, in this lab we assigned to determine if the sodium benzoates are good enough to be used
as food preservative, the sodium benzoates will only be used if the food product has a pH below
4.5, the benzoic acid is occurring naturally and is could be converted to its sodium salt which is
used widely in the food companies as a preservative but the sodium benzoate is preferred over
benzoic acid in many food application because it is 180 times more soluble in water.
Safety Concerns 1

Hydrochloric acid:
Corrosive, Inhalation of vapors can cause coughing, choking, inflammation of the nose, throat,
and upper respiratory tract, and in severe cases, pulmonary edema, circulatory failure and death.
Swallowing hydrochloric acid can case immediate pain and burn of the mouth, throat, esophagus
and gastrointestinal tract. Swallowing may be fatal.
Corrosive, can cause redness, pain, and severe skin burns concentrated solutions cause deep
ulcers and discolor skin.
Vapors are irritating and may cause damage to the eyes, contact may cause severe burns and
permanent eye damage.
1
MSDS
Procedure:

 PART A:
In this experiment we used the microscale, first we started with weighting 0.4000g of