Boiling Point

Foreword

Boiling point is the temperature at which a liquid changes to a gas (vapor) at normal atmospheric pressure.

A more specific definition of boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure.

What does the dictionary say?

The dictionary, on the other hand, defines “Boiling Point” like this:

The temperature at which a liquid starts to boil.

According to wikipedia…

The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure.

Table of contents

You can expect this article to cover:

  • What is boiling point (definition)
  • How can boiling point of a liquid be reduced
  • Does boiling point determine purity
  • Does boiling point increase with pressure
  • What is boiling point elevation
  • How is boiling point measured
  • How to determine boiling point of an element
  • How to determine boiling point of a compound
  • Boiling point trend periodic table
  • Which boiling point is higher
  • How to determine which compound has the highest boiling point
  • How to determine which molecule has a higher boiling point
  • How to determine lowest boiling point
  • How to separate two liquids with the same boiling point
  • How boiling point of liquid is criteria of purity
  • How does boiling point affect gas chromatography
  • Factors on which boiling point depends
  • Boiling point and melting point
  • Boiling point and intermolecular forces
  • How is vapor pressure related to boiling point
  • Boiling point vs melting point
  • Boiling point vs pressure
  • Boiling point under vacuum
  • Boiling point vs altitude
  • Boiling point vs heat of vaporization
  • How to calculate boiling point under vacuum

How can Boiling Point Of A Liquid Be Reduced

The liquid boils at the temperature when the vapor pressure becomes equal to the atmospheric pressure.

So by decreasing the pressure on the liquid, boiling point of the liquid is reduced.

For example : water boils at lower temperature at high altitudes.

Does Boiling Point Determine Purity

Unlike melting points however, boiling points are not generally used as a gauge of purity.

Does Boiling Point Increase With Pressure

The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.

The boiling point cannot be increased beyond the critical point.

What is Boiling Point Elevation

Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent.

This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.

Tip: Turn on the caption button if you need it. Choose “automatic translation” in the settings button, if you are not familiar to the english language.

How is boiling point measured

A liquid's boiling point can be determined using the capillary method, where an inverted capillary is placed in the liquid of interest and the liquid is heated.

When the vapor pressure reaches the atmospheric pressure, the liquid begins to fill the capillary.

The temperature at which this occurs is the boiling point.

Boiling point trend periodic table

Across the period from left to right of the periodic table size of atoms decreases.

As the size decreases the strength of van der Waals forces also decreases.

If intermolecular forces increase, the vapor pressure of the compound decreases, and hence the boiling point of the compound increases.

How to Determine Which Molecule Has A Higher Boiling Point

In general, larger molecules have higher boiling points than smaller molecules of the same kind, indicating that dispersion forces increase with mass, number of electrons, number of atoms or some combination thereof.

How to Separate Two Liquids With The Same Boiling Point

Fractional distillation is a modified distillation process that allows the separation of liquids with similar boiling points.

Which Factors On Boiling Point Depends

The boiling point of a liquid depends on temperature, atmospheric pressure, and the vapor pressure of the liquid.

Boiling point and melting point

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Boiling point and intermolecular forces

Intermolecular forces affect the boiling and melting points of substances.

Substances with weak intermolecular forces will have low melting and boiling points as less energy (heat) is needed to overcome these forces.

How is vapor pressure related to boiling point

The higher the vapor pressure of a liquid at a given temperature, the lower the normal boiling point (i.e., the boiling point at atmospheric pressure) of the liquid.

Boiling point vs pressure

Boiling point is the temperature at which the vapor pressure is equal to the external pressure applied on the liquid.

The boiling point of a liquid varies depending upon the surrounding environmental pressure.

A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure.

A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure.

Citation

When you need to include a fact or piece of information in an assignment or essay you should also include where and how you found that piece of information (Boiling Point).

That gives credibility to your paper and it is sometimes required in higher education.

To make your life (and citation) easier just copy and paste the information below into your assignment or essay:

Luz, Gelson. Boiling Point. Materials Blog. Gelsonluz.com. dd mmmm. yyyy. URL.

Now replace dd, mmmm and yyyy with the day, month, and year you browsed this page. Also replace URL for the actual url of this page. This citation format is based on MLA.

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Materials: Boiling Point
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