Information about Dalton's Law
For the law of stoichiometry, see .
In chemistry and physics, Dalton's law (also called Dalton's law of partial pressures) states that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture. This empirical law was observed by John Dalton in 1801 and is related to the ideal gas laws.
Mathematically, the pressure of a mixture of gases can be defined as the summation
or 
where
represent the partial pressure of each component.
It is assumed that the gases do not react with each other.
where
the mole fraction of the i-the component in the total mixture of m components .
The relationship below provides a way to determine the volume based concentration of any individual gaseous component.
where:
is the concentration of the ith component expressed in ppm.
Dalton's law is not exactly followed by real gases. Those deviations are considerably large at high pressures. In such conditions, the volume occupied by the molecules can become significant compared to the free space between them. Moreover, the short average distances between molecules raises the intensity of intermolecular forces between gas molecules enough to substantially change the pressure exerted by them. Neither of those effects are considered by the ideal gas model.
See also
Concepts in distillation | |
|---|---|
| Principles | Raoult's law, Dalton's law, Reflux, Fenske equation, McCabe-Thiele method, Theoretical plate |
| Industrial processes | Batch distillation, Continuous distillation, Fractionating column |
| Laboratory methods | Rotary evaporator, Kugelrohr, Spinning band distillation |
| Techniques | Fractional distillation, Vacuum distillation, Extractive distillation, Reactive distillation, Dry distillation, Destructive distillation, Azeotropic distillation, Steam distillation |
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Physics is the science of matter[1] and its motion[2][3], as well as space and time[4][5] —the science that deals with concepts such as force, energy, mass, and charge.
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Pressure (symbol: p) is the force per unit area applied on a surface in a direction perpendicular to that surface.
Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.
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Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.
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Gas is one of the four major states of matter, consisting of freely moving atoms or molecules without a definite shape. Compared to the solid and liquid states of matter a gas has lower density and a lower viscosity.
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In a mixture of ideal gases, each gas has a partial pressure which is the pressure which the gas would have if it alone occupied the volume. The total pressure of a gas mixture is the sum of the partial pressures of each individual gas in the mixture.
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A central concept in science and the scientific method is that all evidence must be empirical, or empirically based, that is, dependent on evidence or consequences that are observable by the senses. Empirical data is data that is produced by experiment or observation.
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John Dalton (September 6, 1766 – July 27, 1844) was an English chemist, meteorologist and physicist, born at Eaglesfield, near Cockermouth in Cumbria. He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness
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18th century - 19th century - 20th century
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Subjects: Archaeology - Architecture -
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1770s 1780s 1790s - 1800s - 1810s 1820s 1830s
1798 1799 1800 - 1801 - 1802 1803 1804
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Subjects: Archaeology - Architecture -
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An ideal gas or perfect gas is a hypothetical gas consisting of identical particles of zero volume, with no intermolecular forces. Additionally, the constituent atoms or molecules undergo perfectly elastic collisions with the walls of the container.
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The gas laws are a set of laws that describe the relationship between thermodynamic temperature (T), pressure (P) and volume (V) of gases. They are a loose collection of rules developed between the late Renaissance and early 19th century.
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chemical reaction is a process that results in the interconversion of chemical substances.[1] The substance or substances initially involved in a chemical reaction are called reactants.
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In chemistry, the mole fraction of a component in a mixture is the relative proportion of molecules belonging to the component to those in the mixture, by number of molecules. It is one way of measuring concentration.
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In chemistry, concentration is the measure of how much of a given substance there is mixed with another substance. This can apply to any sort of chemical mixture, but most frequently the concept is limited to homogeneous solutions, where it refers to the amount of
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"parts-per" notations are used to denote low concentrations of chemical elements. Also known as mixing ratios, they are often used to denote the relative abundance of trace elements in the Earth's crust, trace elements in forensics or other analyses, dissolved minerals in water, or
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In physics, chemistry, and biology, intermolecular forces are forces that act between stable molecules or between functional groups of macromolecules. These non-covalent forces, which give rise to bonding energies of less than a few kcal/mol, are generally much weaker than the
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Raoult's law states that
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- The vapor pressure of an ideal solution is dependent on the vapor pressure of each chemical component and the mole fraction of the component present in the solution [1].
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The mole (symbol: mol) is the SI base unit that measures an amount of substance. One mole contains Avogadro's number (approximately 6.0221023) entities.
A mole is much like "a dozen" in that both are absolute numbers (having no units) and can describe any type of
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A mole is much like "a dozen" in that both are absolute numbers (having no units) and can describe any type of
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Distillation is a method of separating chemical substances based on differences in their volatilities in a boiling liquid mixture. Distillation usually forms part of a larger chemical process, and is thus referred to as a unit operation.
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Raoult's law states that
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- The vapor pressure of an ideal solution is dependent on the vapor pressure of each chemical component and the mole fraction of the component present in the solution [1].
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Reflux is a technique used in industrial and laboratory distillations. It is also used in chemistry to apply energy to reactions over a long time.
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Reflux in industrial distillation
The term reflux [1][2]..... Click the link for more information.
The Fenske equation in continuous fractional distillation is an equation used for calculating the minimum number of theoretical plates required for the separation of a binary feed stream by a fractionation column that is being operated at total reflux (i.e.
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The graphical approach presented by McCabe and Thiele in 1925, the McCabe-Thiele method is considered the simplest and perhaps most instructive method for analysis of binary distillation.
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A theoretical plate in many separation processes is a hypothetical zone or stage in which two phases, such as the liquid and vapor phases of a substance, establish an equilibrium with each other.
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Batch distillation[1] refers to the use of distillation in batches, meaning that a mixture is distilled to separate it into its component fractions before the distillation still is again charged with more mixture and the process is repeated.
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Continuous distillation, a form of distillation, is an ongoing separation in which a mixture is continuously (without interruption) fed into the process and separated fractions are removed continuously as output streams as time passes during the operation.
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A Fractionating Column or Fractionation Column is an essential item used in the distillation of liquid mixtures so as to separate the mixture into its component parts, or fractions, based on the differences in their volatilities.
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rotary evaporator, or rotavap, is a device used in chemical and biochemical laboratories for the efficient and gentle evaporation of solvents. The main components of a rotary evaporator are a vacuum system, consisting of a vacuum pump and a controller, a rotating evaporation
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Kugelrohr (literally "ball tube") is a short path vacuum distillation apparatus typically used to distill relatively small amounts of high boiling (> 300 °C) compounds under greatly reduced pressure in the laboratory.
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Spinning band distillation is a technique used to separate liquid mixtures which are similar in boiling points. When liquids with similar boiling points are distilled, the vapors are mixtures, and not pure compounds.
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Fractional distillation is the separation of a mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which several fractions of the compound will evaporate.
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