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Topic: Base dissociation constant

	Dissociation Summary
		Dissociation may be accomplished by the addition of energy, as in the case of gaseous molecules dissociated by heat; or by the action of a solvent on a polar compound (i.e., electrolytic decomposition).
		Attention to dissociation as a clinical feature is growing in recent years as a concommitant to knowledge of post-traumatic stress disorder, and as neuroimaging research and population studies show its relevance.
		Dissociation most often makes the news with regards to soldiers' responses to wartime stress, rape victims with amnesia for details, and in occasional criminal trials where the question of whether a person with Dissociative Identity Disorder (DID) can be responsible for his or her actions.
	www.bookrags.com /Dissociation (1797 words)

	Acid-Base Equilibria
		The relative strengths of an acid and its conjugate base are reciprocally related; the stronger an acid, the weaker its conjugate base, and the weaker an acid, the stronger its conjugate base.
		In general, bases: (a) turn blue litmus to red; (b) react with metals to produce hydrogen gas; (c) are insoluble in water (d) have a sour taste; (e) have a bitter taste.
		The conjugate base of an acid: (a) is the molecule or ion left after the acid accepts a proton; (b) is not stable under most conditions; (c) is a stronger acid than the original acid; (d) is the molecule or ion left after the acid donates a proton; (e) cannot itself be an acid.
	eagle.clarion.edu /~faculty/krugh/ch16/notes.html (2808 words)

	Dissociation constant - Wikipedia, the free encyclopedia
		In chemistry and biochemistry, a dissociation constant is a specific type of equilibrium constant that measures the propensity of a larger object to separate (dissociate) reversibly into smaller components, as when a complex falls apart into its component molecules, or when a salt splits up into its component ions.
		Dissociation constants are commonly used to describe how tightly a ligand (such as a drug) binds to a protein.
		The dissociation constant has the units of molar (M), and corresponds to the concentration of ligand [L] at which the binding site on the protein is half occupied, i.e., when the concentration of protein with ligand bound [C] equals the concentration of protein with no ligand bound [P].
	en.wikipedia.org /wiki/Dissociation_constant (617 words)

	ACIDS AND BASES IN ORGANIC CHEMISTRY
		The equilibrium constant K for this dissociation measures the extent of hydronium ion formation and thus, effectively, how strong the Bronsted acid is. In this case strength refers to the relative tendency of the acid to protonate water.
		Thus the acid dissociation constant is the equilibrium constant K multiplied by the constant concentration of water in water.
		The conjugate base of a carboxylic acid is a carboxylate anion.
	research.cm.utexas.edu /nbauld/teach/acidsbases.html (2966 words)

	CHEMystery: Acids and Bases
		A Base is a substance that produces an OH when it is dissolved in water (Arrhenius).
		The weaker the base, the smaller its Kb.
		Kb always refers to the reaction of a base with water to from the conjugate acid and the hydroxide ion.
	library.thinkquest.org /3659/acidbase/acidsandbases.html (462 words)

	Acid Base Reactions (Site not responding. Last check: 2007-09-08)
		Likewise the strength of a base is determined by the extent to which it accepts a proton in the presence of a common acid such as water.
		Strong bases dissociate completely such that if BOH in equation [5.16] is a strong base, the reaction goes completely to the right and [BOH] essentially equals zero (this can be demonstrated in a similar manner to example 5.5).
		Note the dissociation constant for the conjugate acid of base B would be determined by adding the acid [BH+ ] on the right-hand side of equation [5.24] to water.
	www.ce.udel.edu /~cawalker/AcidBase.html (3800 words)

	Acid-Base Hmwk: Dissociation Const (Site not responding. Last check: 2007-09-08)
		Again, the equilibrium constant for all strong bases is very large, essentially infinite, because the equilibrium concentration of the undissociated strong base is essentially zero.
		It is the equilibrium constant for the dissociation of a base in water.
		The relationship between a conjugate acid and base pair is that the stronger the acid the weaker its conjugate base, and the stronger the base, the weaker its conjugate acid.
	cgh.hkcampus.net /~cgh-kam/AL_chem_AB/0/acbspg1.dir/discon.html (499 words)

	Drug Pathways and Chemical Concepts- 8. Dissociation Constant
		The dissociation constant is one of the most important characteristics of a pharmaceutical compound.
		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)

	[No title] (Site not responding. Last check: 2007-09-08)
		Avogadro's law - A statement that the volume of a gas maintained at constant temperature and pressure is directly proportional to the quantity of the gass.
		Boyle's law - A law stating that at constant temperature, the product of the volume and pressure of a given amount of gas is a constant.
		Plank's constant - The constant that relates the energy and frequency of a photon, E = hv.
	webpages.marshall.edu /~elkins50/definitions.htm (3482 words)

	CHM 1046 (Site not responding. Last check: 2007-09-08)
		Base reaction of NH + Conjugate acid reaction of NH = Ionization of H
		) and the base-dissociation constant for its conjugate base (i.e.
		In tables of dissociation constants for acids or bases, often only the value for the acid-dissociation constants is given.
	wine1.sb.fsu.edu /chm1046/notes/AcidBase/KaKb/KaKb.htm (268 words)

	SparkNotes: Fundamentals of Acids and Bases: Fundamentals of Acid-Base Chemistry
		The Bronsted-Lowry model of acids and bases serves that need by describing acids as proton donors and bases as proton acceptors.
		The Lewis model of acids and bases proposes that an acid is an electron pair acceptor while a base is an electron pair donor.
		The equilibrium constant given in figure 1.4 is for the reaction of an acid, HA, with water as shown.
	www.sparknotes.com /chemistry/acidsbases/fundamentals/section1.html (865 words)

	Chemistry: Acids and Bases
		The equilibrium constant for the dissociation of an acid is known as K
		An acid-base titration is when you add a base to an acid until the equivalence point is reached which is where the moles of acid equals the moles of base.
		For the titration of a strong base with a weak acid, the equivalence point is reached when the pH is greater than seven (7).
	www.shodor.org /UNChem/basic/ab (1233 words)

	UNODC - Bulletin on Narcotics - 1963 Issue 3 - 004
		of ethoheptazine free base in 50% aqueous ethanol.
		To demonstrate this case, codeine phosphate was titrated: the second and third dissociation constants of phosphoric acid are 7.2 and 12.3.
		Values for the base dissociation constant of codeine from 6.1 (Kolthoff, titration of codeine hydrochloride with aqueous sodium hydroxide) to 6.7-6.9 (Baggesgard-Rasmussen and Reimers, from titration of the free base with sodium hydroxide in 50% aqueous ethanol).
	www.unodc.org /unodc/bulletin/bulletin_1963-01-01_3_page005.html (2953 words)

	Acid Dissociation (Site not responding. Last check: 2007-09-08)
		The Bronsted-Lowry definition of acids and bases will be used to identify a number of strong and weak acids and bases.
		Then the strengths of acids and bases will be discussed in terms of the magnitude of the acid (or base) dissociation constant, K
		Finally, the terms "conjugate acid" and "conjugate base" will be introduced, and it will be shown that in every acid-base reaction, the reacting acid loses a proton to form its conjugate base, and the reacting base gains a proton, to form its conjugate acid.
	www.owlnet.rice.edu /~chem122/lecture/Outlines/lect10.html (106 words)

	Successive Approximations-Chemical Equilibrium
		For the last three equations, we'll use the equilibrium expressions for either the three acid dissociation reactions of H3BO3, or the three base dissociation reactions of BO3.
		So instead, we'll calculate the base dissociation constants, which are much larger, and relate them to the ion-products of the corresponding reactions:
		Based on this equation set, we will define a column-vector of six unrestricted functions and a column-vector of six unknown concentrations, which we'll name vectors F and Z respectively.
	members.ispwest.com /patrussell/approximations/Borate.htm (881 words)

	Chemical Theory - ChemIndustrial Systems, Inc.
		A buffer consists of a mixture of an acid and its conjugate base or a base and its conjugate acid. A buffered solution resists changes in pH when acids or bases are added because the buffer consumes the added acid or base. As the buffer is consumed, it becomes less resistant to changes in pH.
		The Henderson-Hasselbalch Equation defines the pH of a solution, provided the acid’s dissociation constant and the ratio of the conjugate acid and base concentrations are known.
		[2] In actuality, strong acids and bases do not completely dissociate. Their dissociation constants are large and the concentration of the associated acid or base species is negligible.
	www.chemindustrial.com /theory/chemical.htm (1244 words)

	Chapter 16, Section 7 (Site not responding. Last check: 2007-09-08)
		Notice also that in the neutral molecules the lone pairs are on nitrogen atoms and that the other bases are anions of weak acids.
		The chemical formula for the conjugate acid of methylamine is usually written CH The second general category of weak bases is composed of the anions of weak acids.
		ion is the conjugate base of a weak acid, hypochlorous acid.
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter16/medialib/blb1607.html (794 words)

	Acid dissociation constant - Wikipedia, the free encyclopedia
		In chemistry and biochemistry, the acid dissociation constant, the acidity constant, or the acid-ionization constant (K
		This is the dissociation constant for the equilibrium
		indicates a stronger base, since the number of protons accepted is larger at an identical concentration.
	en.wikipedia.org /wiki/Acid_dissociation_constant (846 words)

	General Chemistry Online: Glossary: Acids and bases
		For example, the acid dissociation constant for acetic acid is the equilibrium constant for HC (aq)
		The compound that receives the hydrogen ion is the base; the compound that surrenders it is an acid.
		The most common strong bases are alkali metal and alkaline earth metal hydroxides.
	antoine.frostburg.edu /chem/senese/101/acidbase/glossary.shtml (606 words)

	Equilibrium Constant (Site not responding. Last check: 2007-09-08)
		where p is pressure of a particular gas (its partial pressure) in an equilibrium mixture, V is the total volume, n is the number of moles of the particular gas, R is the general gas constant, and T is the absolute temperature.
		Note that water is omitted from the expression because it is present in such vast excess that its concentration changes negligibly on the formation of equilibrium and is therefore effectively constant.
		The concentration of the water is included in the equilibrium constant, and K
	www.avogadro.co.uk /definitions/kc.htm (195 words)

	SparkNotes: pH Calculations: Terms
		Base - A substance that can accept a proton, release OH, or donate an electron pair.
		Buffer - A solution composed of an acid and its conjugate base that serves to moderate the pH of the solution.
		Conjugate Base - A molecule that can be described as an acid that has lost one proton.
	www.sparknotes.com /chemistry/acidsbases/phcalc/terms.html (301 words)

	Dorlands Medical Dictionary
		kappa, the tenth letter of the Greek alphabet; symbol for dielectric constant and for one of the two types of immunoglobulin light chains (see immunoglobulin).
		kilobase pairs (1000 base pairs in a nucleic acid).
		(K) (kel´vin) [after Lord Kelvin] the base SI unit of temperature, equal to 1/273.15 of the absolute temperature of the triple point of water.
	www.mercksource.com /ppdocs/us/common/dorlands/dorland/dmd_k_01.htm (2448 words)

	Course Syllabus - CHEM1412
		Calculate the percent dissociation of a monoprotic acid given the acid-dissociation constant.
		Write the equation for the base dissociation constant for a weak base.
		Describe the properties of the nitrogen bases in the DNA chain.
	www.tc.cc.tx.us /syllabus/?course=CHEM1412 (2031 words)

	pH lectures - introduction to acid/base equilibrium
		Additional parameter used quite often to describe dissociation is a dissociation percentage (or dissociation fraction), defined as ratio of dissociated particles to all particles put into the solution.
		It is commonly believed that strong acids and strong bases are fully dissociated.
		For most practical purposes this is true, but they have their dissociation constants as well and in some cases effects of partial dissociation can be observed.
	www.chembuddy.com /?left=pH-calculation&right=introduction-acid-base-equilibrium (443 words)

	Foundations to Chemistry - adapted from "Chemistry, Matter and the Universe"
		Pyridine is an organic base that reacts with water as follows:
		Hydrazine is a weak base that dissociates in water according to the equation
		+ OH The equilibrium constant for this dissociation at 25'C is 2.0 X 10
	www.chem.ox.ac.uk /vrchemistry/chapter16/Pag45.htm (239 words)

	CHP - Equilibrium Constant (Site not responding. Last check: 2007-09-08)
		The concentration of water in a water solution is constant and this expression simplifies to:
		Dissociation of water: dissociation constant of water, K
		Reaction of bases with water: base dissociation constant, K
	www.chem.vt.edu /chem-ed/courses/equil/intro/eqconst.html (145 words)

	Acid-Base Reactions
		This very large value for the equilibrium constant K tells us that the reaction is product favored.
		When we titrate a strong acid with a strong base and measure the pH of the solution as base is added, we obtain a titration curve (Figure 1).
		A strong acid is completely dissociated and the hydronium ion concentration is the same as the acid concentration:
	wc.pima.edu /~skolchens/C152OL/Ch18/titrat1.htm (499 words)

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