Prepracaion Kriswrote

> kriswrote:
Hello,
>
> How can you make a solution of KCl 3M saturated wit AgCl ?
>
> AgCl is not disolving in water.
>
> Kris
Silver chloride has a verylimited solubility (0.25 mg/L) in water at
room temperature. You would not be able to see it dissolve in water.
Assuming that the solvent is pure water and withoutknowing your exact
requirements (though this one seems to be an electrode solution) there
can be two approaches. It is worthwhile to consult the instruction
manual orsomeone well-experienced before the electrode is damaged
with the wrong solution.
Say your requirement is of 1 liter of solution (for the sake of
discussion):
A)Prepare a saturated solution of silver chloride by adding 0.5 gram
of AgCl in a liter of water and stirring for atleast 30 minutes with
the help of magnetic beadstirrer and slight heating. Filter the
solution and use this as a *solvent* for preparing 3 M KCl solution
instead of pure water. Filteration may again be necessary. Thiswould
be a solution of KCl saturated with AgCl.
B) Silver chloride dissolves in concentrated chloride solutions by
forming silver-chloro-complexes, since 3 M KClis a fairly
concentrated soution so it can be expected that silver chloride would
dissolve in it. Add the required amount of solid KCl in a 1 L beaker
containing say800 mL of water and and add silver chloride in it,
dissolve the mass in water with the help of magnetic bead stirrer
and see if any residue is left, if not add moresilver chloride.
Tranfer this solution quantitatively in a 1 L volumetric flask and
dilute to the mark.
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