- published: 19 Oct 2012
- views: 67640
A citrate can refer either to the conjugate base of citric acid, (C3H5O(COO)33−), or to the esters of citric acid. An example of the former, a salt is trisodium citrate; an ester is triethyl citrate.
Since citric acid is a multifunctional acid, intermediate ions exist, hydrogen citrate ion, HC6H5O72− and dihydrogen citrate ion, H2C6H5O7−. These may form salts as well, called acid salts.
Salts of the hydrogen citrate ions are weakly acidic, while salts of the citrate ion itself (with an inert cation such as sodium ion) are weakly basic.
As a weak acid, citrate can be used as a component in buffer solutions, including the commonly used SSC 20X hybridization buffer. This buffer uses sodium citrate and sodium chloride to maintain a neutral 7.0 pH. Other buffers may use a mixture of sodium citrate and citric acid – canonical buffer tables compiled for biochemical studies describe solutions of citrate and acid for buffer pHs of between 3.0 and 6.2.
Citric acid can act as a mild chelating agent; citrate, usually in the form of trisodium citrate, may be given as an anticoagulant, because it chelates calcium ions, and therefore inhibits coagulation. Another application is in the form of iron(II) citrate as a nutritional supplement. Here, the benefit is the solubility as a chelate of the otherwise mostly insoluble iron.
even lady luck
she said she could not help
she's just a dead end queen
keep her away from me
she said, "keep her away from me,
i don't even like to see her breathe
i can't stand staring at the face of me
girl, stay away from me"
she's not the kind that you want to be seen with
she's the dead end queen, she's the dead end queen
she's a dead end queen
she's not the kind that you want to be seen with
she's a dead end queen, she's a dead end queen
a misjustice
i think you've misjudged us
we're not a charlatan
and we don't got no gun, no
wait, just let me see
get close enough to use my telepathy
i'll drain a little piece of you into me
then, i won't get shot
she's a dead end queen
she's not the kind that you want to be seen with
she's the dead end queen, she's the dead end queen
oh no, she's a dead end queen
she's not the kind that you want to be seen with
she's a dead end queen, she's a dead end queen
take it, take it all away
take it, take it all away from her
take it, take it all away
take it, take it all away from her
oh NOOOO
oh NOOOO
oh NOOOO
she's a dead end queen
she's not the kind that you want to be seen with
she's the dead end queen, she's the dead end queen
oh now, she's a dead end queen
she's not the kind that you want to be seen with
she's a dead end queen, she's a dead end queen
take it, take it all away
take it, take it all away from her
take it, take it all away