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Topic: Acidity constant

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Acid dissociation constant

Acid

PKa

Carboxylic acid

Weak acid

Citrate

Propionic acid

Organic acid

Citric acid

Strong acid

Hydrochloric acid

Acetic acid

Equilibrium constant

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	Acidity constant
		In chemistry or biochemistry, the acidity constant or acid dissocation constant () is a specific type of dissociation constant that indicates the extent of dissociation of hydrogen ions from an acid.
		An acid with an acidity constant near 1 is almost completely dissociated when dissolved in water; conversely, an acid with an acidity constant near 0 remains almost completely undissociated.
		Because this number varies over many degrees of magnitude, the acidity constant is often represented by the inverse of its common logarithm, represented by.
	pedia.newsfilter.co.uk /wikipedia/a/ac/acidity_constant.html (268 words)

	Acidity constant - Open Encyclopedia (Site not responding. Last check: 2007-10-22)
		In chemistry and biochemistry, the acidity constant or acid dissocation constant ( $K_a) is a specific type of dissociation$ constant that indicates the extent of dissociation of hydrogen ions from an acid.
		An acid with an acidity constant much greater than 1 is almost completely dissociated when dissolved in water; conversely, an acid with an acidity constant near 0 remains almost completely undissociated.
		Because this number varies over many degrees of magnitude, the acidity constant is often represented by the inverse of its common logarithm, represented by $pK_a .$
	open-encyclopedia.com /PKa (271 words)

	Acid dissociation constant - Wikipedia, the free encyclopedia
		Because this constant differs for each acid and varies over many degrees of magnitude, the acidity constant is often represented by the additive inverse of its common logarithm, represented by the symbol pK
		The acidity constant for the acid HA is the dissociation constant for this equilibrium.
		This is the dissociation constant for the equilibrium
	en.wikipedia.org /wiki/Acidity_constant (442 words)

	Acidity Constant (Site not responding. Last check: 2007-10-22)
		biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant (Ka) is...
		In chemistry and biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant (Ka) is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid.
		The acidity constant is the equilibrium constant for the reaction of AH with water:...
	www.phcomplete.com /2/acidity-constant.html (396 words)

	Encyclopedia: Equilibrium constant
		In chemistry, the equilibrium constant is a theoretically-calculated number associated to a reaction which is an useful tool to determine the concentration of various reactants or products in a system where chemical equilibrium occurs.
		The equation of the equilibrium constant is equal to the product of the product concentrations to the power their respective stoichiometric coeffecients divided by the product of the reactant concentrations to the power of their stoichiometric coefficients.
		If the value is very large, over 1, the reaction is said to lie to the right (of the arrow) indicating a greater concentration of products; values less than 1 lie to the left higher formation rates of reactants, and values of one indicate equal concentrations.
	www.nationmaster.com /encyclopedia/Equilibrium-constant (884 words)

	Acidity - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-10-22)
		Acidity is a controversial novelette written for the popular South Asian website Chowk.com by the notoriously eccentric Pakistani music critic and writer Nadeem F. Paracha.
		Dealing with the rapid social and political changes taking place after the Cold War, the story is also about the author's five-year plight as a heroin addict.
		Written in a style reminiscent of William S. Burroughs Cutup method and early Dada lietrature, Acidity viciously attacks modern consumerism, capitalism and organized religion.
	www.arikah.com /encyclopedia/Acidity (182 words)

	PH - Wikipedia, the free encyclopedia
		Instead it is related to the dissociation constant for the specific solvent used.
		It is necessary to know the value of the equilibrium constant of the reaction for each acid in order to calculate its pH.
		In the context of pH, this is termed the acidity constant of the acid but is worked out in the same way (see chemical equilibrium):
	en.wikipedia.org /wiki/PH (1009 words)

	Acidity (Site not responding. Last check: 2007-10-22)
		The perceived acidity of coffee results from the proton donation of acids to receptors on the human tongue.
		H3O+ This is often written as: AH A- + H+ The acidity constant or acid dissociation constant, Ka, of the couple AH/A...
		H+) is the actual acid and the acidity of the proton-donating-compound, such as an...
	www.phcomplete.com /2/acidity.html (330 words)

	What's Wrong with pH? A Conservator and a Scientist Search for Consensus
		The crucial properties of this acidity scale are the use of electromotive force of the hydrogen ions in the solution being tested, the use of a comparison (standard) solution, and the need for a quite complicated electrical circuit in the measurement.
		A simple application of an acidity scale based on color changes is pH paper, the name being justified only when the paper is used to measure dilute aqueous solutions, in which case the two acidity scales coincide.
		Using the Hammett Acidity Function, an acidity scale can be based on any family of similar molecules that change their absorption characteristics towards any type of electromagnetic radiation upon protonation or deprotonation.
	palimpsest.stanford.edu /waac/wn/wn16/wn16-2/wn16-207.html (3381 words)

	acidity_constant (Site not responding. Last check: 2007-10-22)
		Because this constant differs for each acid and varies over many degrees of magnitude, the acidity constant is often represented by the additive inverse of its common logarithm, represented by the...
		In the context of pH, this is termed the acidity constant of the acid but is worked out in the same way (see chemical equilibrium): K a = [hydrogen ions][acid...
		In our discussion of conductance, we introduced the term acidity constant, K a, as a measure of the concentration of hydronium ions produced by the dissociation of a compound when it was...
	acidity_constant.networklive.org (301 words)

	Encyclopedia: Base dissociation constant
		In chemistry, the equilibrium constant is a theoretically-based number that helps chemists determine the concentration of various reactants or products in a reaction where chemical equilibrium exists.
		Dissociation is a psychological state or condition in which certain thoughts, emotions, sensations, or memories are separated from the rest of the psyche.
		Given a weak acid HA, its dissociation in water is subject to the following chemical equilibrium: Chemical equilibrium is the state in which a chemical reaction proceeds at the same rate as its reverse reaction; the rates of the forward and reverse reactions are equal, and the concentration of the reactants and products stop changing.
	www.nationmaster.com /encyclopedia/Base-dissociation-constant (1206 words)

	Symposium
		Acidity Constants of Fluorescein Compounds with Various Substituents.
		This project investigated the acid dissociation constants of fluorescein with various substituents; the effect of different solvent systems on acid dissociation was also determined.
		The acidity constants were obtained by measuring the absorbances of the compound at various pH values.
	www.emich.edu /symposium/abstracts2002/students/mattieson.html (83 words)

	Maine DEP
		Chronic acidity occurs when lakes and streams cannot counteract the chemical changes brought about by acid rain.
		Episodic acidity occurs only periodically, primarily as a result of storms or snowmelts that empty large amounts of acidic water into lakes and streams.
		In the case of episodic acidity, lakes and streams suffer from intense but short-lived increases in acidity.
	www.state.me.us /dep/air/faqs.htm (1486 words)

	Read about Acid dissociation constant at WorldVillage Encyclopedia. Research Acid dissociation constant and learn about ... (Site not responding. Last check: 2007-10-22)
		weak acids do not fully dissociate and generally have acidity constants far less than 1.
		Because this constant differs for each acid and varies over many degrees of magnitude, the acidity constant is often represented by the
		The acidity constant for the acid HA is the
	encyclopedia.worldvillage.com /s/b/Acidity_constant (333 words)

	PH: Definition and Links by Encyclopedian.com - All about PH
		A lower pH number (for example pH 3) indicates increasing strength of acidity, and a higher pH number (for example pH 11) indicates increasing strength of alkalinity.
		Instead it is related to the disassociation constant[?] for the specific solvent used.
		With a 0.1 M solution of methanoic acid (HCOOH), the acidity constant is equal to:
	www.encyclopedian.com /ph/PH.html (612 words)

	Keto–enol interconversion of 2-phenacylfuran in aqueous solution and in the presence of surfactant micelles (Site not responding. Last check: 2007-10-22)
		units) in the acidity of the keto form of 2PAT, as a carbon acid, was observed on passing from water to an aqueous solution of CTAB, owing to the interaction of the hydrophobic enolate of 2PAT with the cationic micelles of the surfactant.
		This increase in the apparent acidity of the ketone should be ascribed to the stabilization of the enolate of 2PF by the CTAB micelles, as is shown by the large difference between the binding constants, K
		is the ionization constant, and r is the ratio of base- to acid- concentrations of the buffer.
	www.arkat-usa.org /ark/journal/2002/I11_Spinelli/MS-541H/541H.asp (3983 words)

	Titration (Site not responding. Last check: 2007-10-22)
		For polyprotic acids, calculating the acid dissociation constants is only marginally more difficult: the first acid dissociation constant can be calculated the same way as it would be calculated in a monoprotic acid.
		The second acid dissociation constant, however, is the point halfway between the first equivalence point and the second equivalence point (and so on for acids that release more than two protons, such as phosphoric acid).
		As applied to biodiesel, titration is the act of determining the acidity of a sample of WVO by the dropwise addition of a known base to the sample while testing with pH paper for the desired neutral pH=7 reading.
	www.toshare.info /en/Titrant.htm (1002 words)

	EPA - Acid Rain Environmental Benefits
		Increases in water acidity can impair the ability of certain types of fish and water plants to reproduce, grow, and survive.
		From this survey, it was determined that of the water bodies found to be acidic, acid rain was the primary cause of the acidity.
		While the acidity of some lakes and streams can be attributed to natural causes, most cases of acidity in the United States result from acid rain.
	www.epa.gov /Region7/programs/artd/air/acidrain/acidrn2.htm (1051 words)

	L01ieq.html
		This ratio has to be constant at constant temperature since the rate constants are constant under similar conditions.
		A more general approach is based on Lewis definition of acid/base behaviour in which proton exchange is not a condition for the acid/base character of the species, and appropriate definitions are defined in these cases.
		A list of acidity and basicity constants for usual acids is presented in `KaKb.m` library.
	www.ubishops.ca /ccc/div/sci/chem/103b/L01ieq1.html (421 words)

	pK (Site not responding. Last check: 2007-10-22)
		is a measure of the inherent acidity of a compound, i.e.
		scale to gain insight into the variables that determine the acidity of a compound as well as to develop a system for predicting approximate equilibrium constants for a variety of reactions.
		In other words, the equilibrium constant will be greater than 1 whenever the products of the acid-base reaction are more stable than the reactants.
	www.usm.maine.edu /~newton/Chy251_253/Lectures/AcidBase/pK.html (491 words)

	study guide for lab exam 1 (Site not responding. Last check: 2007-10-22)
		The alkalinity or acidity of a solution is expressed in pH units.
		This is a constant which defines the extent of absorbance by the compound.
		For proteins, E is used in the form "molar absorption coefficient", e, the absorbance of a 1 M solution of the molecule at a given wavelength through a 1 cm path length.
	tecn.rutgers.edu /bio301s/study%20guide%20for%20lab%20exam%201.htm (1281 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The accepted value for the acidity constant of ethanoic acid is 1.7 × 10—5 and of the ammonium ion is 5.6 × 10—10.
		Experiment 44: Determination of two acidity constants PURPOSE In this activity, you will use a pH sensor to measure and record pH as you determine the value of the equilibrium constant for the ionisation of ethanoic (acetic) acid and for the ionisation of the ammonium ion.
		Calculate the acidity constant of the ammonium ion.
	www.hi.com.au /chemtwotrb/Chtwo_44.doc (1291 words)

	Anorganische Chemie Arbeitsgruppe Deiseroth (Universität Siegen) (Site not responding. Last check: 2007-10-22)
		The strength of a Brönsted acid is measured by its acidity constant Ka, and the strength of a Brönsted base is measured by its basicity constant Kb.
		A solvent with a large autoprotolysis constant (that is a weaker acid) can be used to discriminate between a wide range of acid and base strengths.
		An acid or base is classified as either weak or strong depending on the size of its acidity constant.
	www.uni-siegen.de /~anchem/lehre/talksws0304/broenstedacidity.htm (329 words)

	Prevent Arthritis and Cure Back Pain (Site not responding. Last check: 2007-10-22)
		When pain occurs in symmetrical joints, it is the indication that the brain assesses the strain to be equal for all joints and therefore assumes these joints are not fully prepared to endure a particular level of pressure until the one or all of them are fully hydrated.
		Salt helps to extract the "acidity" from the inside of the cartilage cells and pass it into the water that will carry the "acid" away from the medium.
		The joint cartilage cells begin to die at a faster pace because of the constant high acidity and abrasive friction in the dehydrated joint.
	www.garynull.com /Documents/Arthritis/Prevent_Arthritis_and_Cure_Back_Pain.htm (2454 words)

	Phenobarbitol Drug Development - 11. Spectrophotometric pKa Determination
		Upon completion of this laboratory, the student should be able to determine the dissociation constant of a chemical moiety based on the degree of ionization of its acidic and basic components.
		One of the most important of properties of a drug molecule is its acidity constant.
		The determination of an acid dissociation constant requires the estimation of the equilibrium concentration of the acid and base forms of the drug.
	chemcases.com /pheno/pheno11.htm (644 words)

	Drug Pathways and Chemical Concepts- 8. Dissociation Constant
		The dissociation constant is sometimes called the acidity constant or the ionization constant.
		It is a numeric representative of the relative proton transfer for that substance, or the likelihood of that compound donating a proton.
		This dissociation constant is an important characteristic of drug molecules, and provides a tool to anticipate some of the "behaviors" of that compound.
	science.kennesaw.edu /~mhermes/pheno/pheno08.htm (942 words)

	D - Glossary of chemical terms
		Dielectric constant or permittivity (ε) is an index of the ability of a substance to attenuate the transmission of an electrostatic force from one charged body to another.
		The standard measurement apparatus utilizes a vacuum whose dielectric constant is 1.
		Dissociation constant is a constant whose numerical value depends on the equilibrium between the undissociated and dissociated forms of a molecule.
	www.ktf-split.hr /periodni/en/abc/d.html (830 words)

	CARBONIC ACID FACTS AND INFORMATION (Site not responding. Last check: 2007-10-22)
		→ CO The equilibrium between carbon dioxide and carbonic acid is important for controlling the acidity of body fluids, and almost all living organisms have an enzyme, carbonic_anhydrase, which catalyzes the conversion between the two compounds, increasing the reaction rate by a factor of nearly 10
		This figure is often quoted as the dissociation constant of carbonic acid, although this is ambiguous: it might better be referred to as the acidity constant of carbon dioxide, as it
		However, the acidity of rain water has important geological consequences for carbonate rocks such as chalk and limestone.
	www.witwib.com /Carbonic_acid (489 words)

	Acidity Constant Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-22)
		Looking For acidity constant - Find acidity constant and more at Lycos Search.
		Look for acidity constant - Find acidity constant at one of the best sites the Internet has to offer!
		determination of the dissocation of the constant of weak acid
	www.karr.net /encyclopedia/Acidity_constant (612 words)

	Gastric Acid Balance: (Site not responding. Last check: 2007-10-22)
		Conversely, low stomach acidity is associated with the rapid invasion of microorganisms from the colon, leading to gastric and intestinal bacterial colonization and overgrowth.
		This approach is the opposite of what should often be done, and in many cases only worsens the problem by suppressing gastric acidity when it is needed and promoting it (rebound phenomenon) when it is unnecessary.
		Gastric acidity influences the blood response to a B-carotene dose in humans.
	www.tasty-nuggets.com /library/gastric.acid.html (1921 words)

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