Labour or labor may refer to:

Childbirth, the delivery of a baby
Labour (human activity), or work
Manual labour, physical work
Wage labour, a socioeconomic relationship between a worker and an employer
Organized labour and the labour movement, consisting principally of labour unions
The Labour Party (UK)

Literature
Labor (journal), an American quarterly on the history of the labor movement
Labour/Le Travail, an academic journal focusing on the Canadian labour movement
Labor (Tolstoy book) or The Triumph of the Farmer or Industry and Parasitism (1888)

Places
La Labor, Honduras
Labor, Koper, Slovenia

Other uses
Labor (album), a 2013 album by MEN
Labor (area), a Spanish customary unit
"Labor", an episode of TV series Superstore
Labour (constituency), a functional constituency in Hong Kong elections
Labors, fictional robots in Patlabor

People with the surname
Earle Labor (born 1928), professor of American literature
Jérémy Labor (born 1992), French footballer
Josef Labor (1842–1924), Austrian musician and composer

See also
Labor Day (disambiguation)
Labour law
Labour Party (disambiguation)
Work (disambiguation)
All pages with titles beginning with Labour
All pages with titles containing Labour
All pages with titles beginning with Labor
All pages with titles containing Labor
EDTA4− usually binds to a metal cation through its two amines and four carboxylates, i.e., it is It a hexadentate ("six-toothed") chelating agent. Many of the resulting coordination compounds adopt octahedral geometry. Although of little consequence for its applications, these octahedral complexes are chiral. The cobalt(III) anion [Co(EDTA)]− has been resolved into enantiomers. Many complexes of EDTA4− adopt more complex structures due to either the formation of an additional bond to water, i.e. seven-coordinate complexes, or the displacement of one carboxylate arm by water. The iron(III) complex of EDTA is seven-coordinate. Early work on the development of EDTA was undertaken by Gerold Schwarzenbach in the 1940s. EDTA forms especially strong complexes with Mn(II), Cu(II), Fe(III), Pb(II) and Co(III).Several features of EDTAs complexes are relevant to its applications. First, because of its high denticity, this ligand has a high affinity for metal cations:

[Fe(H2O)6]3+  +  H4EDTA  ⇌ [Fe(EDTA)]−  +  6 H2O  +  4 H+   Keq = 1025.1Written in this way, the equilibrium quotient shows that metal ions compete with protons for binding to EDTA. Because metal ions are extensively enveloped by EDTA, their catalytic properties are often suppressed. Finally, since complexes of EDTA4− are anionic, they tend to be highly soluble in water. For this reason, EDTA is able to dissolve deposits of metal oxides and carbonates. The pKa values of free EDTA are 0, 1.5, 2, 2.66 (deprotonation of the four carboxyl groups) and 6.16, 10.24 (deprotonation of the two amino groups).