What is the calorific value of benzoic acid?

6,318 Cal/g.
The calorific value of the benzoic acid was assumed to be 6,318 Cal/g.

What is ee value in bomb calorimeter?

The EE factor is the energy correction value that accounts for heat absorbed by the calorimeter during the combustion and is typically 920-940 cal/°C for this instrument. This is determined by averaging the energy corrections for 10 runs of the benzoic acid standard.

What is the heat of combustion of benzoic acid?

26438 f 4 j/g
The mean value of the absolute heat of combustion of benzoic acid under standard bomb conditions in some series of determinations carried out in the years 1946-1948 is 26438 f 4 j/g.

Why do you need to combustion benzoic acid before testing the unknown sample you are interested in?

Why do you need to combust more than one sample of the “unknown” you are testing? (3 points) Through the use of a calibration sample of known combustion value (often benzoic acid[2], including here), the heat capacity of the calorimeter system can be determined, allowing for the calculation of the heat of combustion of …

Why is benzoic acid used in bomb calorimeter?

Benzoic acid (C6H5CO2H) is often used for this purpose because it is a crystalline solid that can be obtained in high purity. The combustion of benzoic acid in a bomb calorimeter releases 26.38 kJ of heat per gram (i.e., its ΔHcomb = −26.38 kJ/g).

How is benzoic acid formed?

Benzoic acid is produced commercially by partial oxidation of toluene with oxygen. The process is catalyzed by cobalt or manganese naphthenates. The process uses abundant materials, and proceeds in high yield.

What is water equivalent bomb?

In a specific reaction the quantity of heat that raises the temperature of some substance by some amount, the same quantity of heat can simultaneously raise the same temperature of a certain mass of water assuming the specific heat of water to be 1 calorie per gram. The mass of water is then termed as water equivalent.

Why do you have to calibrate a bomb calorimeter?

Bomb calorimeters require calibration to determine the heat capacity of the calorimeter and ensure accurate results. The temperature change produced by the known reaction is used to determine the heat capacity of the calorimeter.

For this purpose we press the powdery substance into tablets of approximately 0.5 grams and 1.0 grams, with a calorific value of approximately 26.454KJ/g. The calibration of an oxygen bomb calorimeter system (also called standardization) is done using a tablet of benzoic acid.

How is benzoic acid prepared in the laboratory?

Benzoic acid is cheap and readily available, so the laboratory synthesis of benzoic acid is mainly practiced for its pedagogical value. It is a common undergraduate preparation. Benzoic acid can be purified by recrystallization from water because of its high solubility in hot water and poor solubility in cold water.

How are benzoic acid tablets used in Bomb calorimeters?

The calibration of an oxygen bomb calorimeter system (also called standardization) is done using a tablet of benzoic acid. DDS Calorimeters manufacture our own benzoic acid tablets, which are suitable for use in all our oxygen bomb calorimeter systems.

What does benzoic acid do to your body?

Benzoic acid is a common ingredient added to food products and cosmetics alike to help extend shelf life and fight the growth of yeast and bacteria. Sodium benzoate is also used as a preservative and is actually the sodium salt of benzoic acid.