dissociation constant
Let an agent explain dissociation constants and their interpretation, convert between forms such as pKa and Kd, use them in calculations, and find values with sources.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain dissociation constants and their interpretation, convert between forms such as pKa and Kd, use them in calculations, and find values with sources.
An equilibrium constant describing the tendency of a complex, salt or molecule to separate reversibly into its components, such as the acid dissociation constant for proton loss, the dissociation constant of a ligand-receptor or enzyme-inhibitor complex, or the ion dissociation of a salt, expressed in concentration units and often as its negative logarithm; a smaller constant indicates tighter binding or weaker dissociation.
What it is for: Quantifying reversible dissociation and binding.
It can be explain dissociation constants; convert between Ka, pKa, Kd and related forms; use constants in calculations; find values with sources.
Distinguishing features
Equilibrium quantity
Condition-dependent
Logarithmic forms common
Binding measure
What it looks like
Not physical; a numerical constant.
How it is recognised
Equilibrium constant for dissociation
Concentration units
An association constant is its reciprocal
Related models
is a kind of - category
is a kind of - category
is related to - acid strength
is related to - independent of amount
In practice
Families and kinds
acid dissociation constants
base dissociation constants
ligand binding dissociation constants
salt and complex dissociation constants
apparent and conditional constants
Standards and regulation
IUPAC recommendations on equilibrium constants
Standard conditions for reporting
Assay guidelines in pharmacology
Failure modes and hazards
Confusing Kd with IC50 or Ki
Ignoring temperature and ionic strength
Unit errors
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.dissociation-constant
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What it means.
Concepts.
Meaning
Interpretation.
Meaning
Meaning.
- What does a dissociation constant mean, and how do a small or large value relate to binding strength or acid strength? definition
- How do Ka, pKa, Kb and Kd relate? definition
Conditions
Dependence on conditions.
Conditions
Conditions.
- How do temperature, ionic strength and solvent affect dissociation constants? definition
- What are apparent and conditional constants? definition
Compute Calculations.
Use.
Acid
Acid-base calculations.
Acid
Acid-base.
- How is pH or degree of dissociation calculated from a pKa and concentration? action
- How are buffers designed using pKa? action
Binding
Binding calculations.
Binding
Binding.
- How is receptor occupancy or fraction bound computed from Kd and ligand concentration? action
- How do Kd, Ki and IC50 differ? definition
Measure Determining constants.
Methods.
Methods
Measurement methods.
Methods
Methods.
- How are dissociation constants measured, from titration to isothermal calorimetry and surface plasmon resonance? provenance
- How reliable are reported values? boundary
Lookup
Finding values.
Lookup
Lookup.
- What is the dissociation constant of this acid or complex, according to reference data, and under which conditions? provenance
- Which databases apply? provenance
Learn Teaching.
Education.
Teach
Teaching.
Teach
Teaching.
- How can dissociation constants be taught with worked examples? action
- Which misconceptions arise? provenance
History
History.
History
History.
- How did the concept of dissociation constants develop, from Arrhenius and Ostwald onward? provenance
- Which references are standard? provenance
What the second pass must settle
- Should acid dissociation constants be a separate entry?
- How should databases be linked?
- How should measurement methods be linked?