Boiling Point Definition, Boiling point as physical properties

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Boiling Point Definition: The temperature at which the vapor pressure of the liquid is equal to atmospheric pressure. The boiling point of a liquid varies according to the applied pressure and hence increases with increased pressure.  At sea level, water boils at 100° C (212° F), while at higher altitudes the temperature of the boiling point is lower.

Intermolecular forces and boiling point

The stronger the intermolecular forces, the higher the boiling point and the lower the vapor pressure of the substance and the higher the boiling point and the weaker the intermolecular force, lower the boiling point and higher the vapor pressure.

Is boiling point a physical or chemical property?

Physical property accounts for the change in the state: solid to liquid; solid to gas; liquid to gas without any change in their chemical composition. When water boils at 100o Celsius, a change in state from liquid to vapor takes place with neither change in chemical bonds nor the formation of new substances. Hence, the boiling point is considered a physical property.

Boiling points of some materials/chemicals:

CompoundBoiling pointCompoundBoiling point
Water100oCHCl– 82.05oC / 188.1K
Methanol64.7oC HBr– 66oC / 207.1K
Ethanol 78.37oC HF19.5oC
Acetone 56oC NH3– 33.34oC / 239.8K
Toluene 100.6oC SiH4– 112oC / 161.1K
Alcohol 78.37oC Milk100.5oC
Benzene 80.1oC CO2– 78.46oC / 194.7K
Cyclohexane 80.75oC NaCl1465oC
Diethyl ether 34.6oC NaHCO3851oC
Ethylene glycol 197oC Dichloromethane39.6oC
Isopropyl alcohol 82.5oC Iodine184.3oC
Benzoic acid 249.2oC Helium– 268.9oC / 4.22K
Sulphuric acid 337oC Argon– 185.8oC / 87.3K
Acetic acid 118oC Oil300oC
Methane– 161.6oC / 111.5KOxygen– 183oC / 90.19K
Ethane – 89oC / 184.1K Hydrogen– 252.9oC / 20.28K
Propane – 42oC / 231.1K Nitrogen– 195.8oC / 77.36K
Butane – 1oC / 272.2K Fluorine– 188.1oC / 85.04K
Pentane 36.2oC Chlorine– 34.04oC / 239.1K
Hexane 69oC Br258.8oC
Heptane 98.42oC CCl476.72oC
Octane 125.6oC H2S– 60oC / 213K
Ethyl acetate 77.1oC CH3OCH324oC / 249K
Diethyl ether 34.6oC CO– 191.5oC / 81.65K
1-butanol 117.7oC NaOH1388oC
1-propanol 97oC Cyclohexane80.75oC

FAQ:

What is boiling point?

Boiling point is the temperature at which the vapor pressure of the liquid is equal to atmospheric pressure.

What is the boiling point of water (in celsius)?

The boiling point of water is 100 degree celsius.

What is the boiling point of water in Fahrenheit?

The boiling point of water is 212o F

Is boiling point a physical property?

Yes, boiling point is a physical property because when a liquid boils, change in the state takes place without changing its chemical composition.

What is the boiling point of ethanol?

The boiling point of ethanol is 78.37oC .

Boiling point equation

The boiling point equation is: Δ T = mKb, where m is molality, and Kb is molal boiling point-elevation constant.

Boiling point elevation formula

The boiling point elevation formula is: Δ T = mKb, where m is molality, and Kb is molal boiling point-elevation constant.

How is vapor pressure related to boiling point?

Boiling point is the temperature at which the vapor pressure of the liquid becomes equal to atmospheric pressure. In general, the boiling point decreases with an increase in vapor pressure.

Boiling point definition, setup/apparatus of boiling point

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