Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
-----------------
hydrochloric acid : HCl
sodium fluoride : NaF
lithium carbonate : Li2CO3
Class:
------
precipitation
elem=Li,F
Summary:
--------
Lithium fluoride is only sparingly soluble.
Description:
------------
Dissolve some lithium carbonate in a small amount of dilute hydrochloric
acid. This is associated with a lot of bubbling. Continue adding lithium
carbonate, until addition of more lithium carbonate does not result in
vigorous bubbling anymore. Let white solid settle and decant the clear
liquid in a separate test tube. The clear liquid is a solution of LiCl,
with possibly a minute quantity of carbonate present as well (lithium
carbonate is slightly soluble in water).
Prepare a solution of sodium fluoride and add this to the solution of LiCl:
The liquid becomes turbid. There is not a clear flocculent precipitate, but
the liquid becomes somewhat milky. This is caused by formation of solid LiF.