Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
-----------------
hydrochloric acid : HCl
metol : (CH3 NH C6H4 OH)2 . H2SO4
pyrogallol : C6H3 (OH)3
hydroquinone : HO C6H4 OH
resorcinol : HO C6H4 OH
catechol : C6H4 (OH)2
ferric chloride : FeCl3 . 6H2O
ferrous sulfate : FeSO4 . 7H2O
Class:
------
elem=Fe
coordination
Summary:
--------
Phenol and its derivatives form highly colored coordination complexes
with ferrous and ferric ions.
Description:
------------
A set of experiments is performed with two types of solutions of iron-salt and
a range of solutions of common photographic developers and reseorcinol. The
following solutions of iron-salts are prepared:
ferrous sulfate
ferric chloride, acidified with some hydrochloric acid
To these solutions the photo developers were added. Each developer was added
to its own solution of iron-salt.
The following table can be made of all performed color-reactions:
| catechol | resorcinol | hydroquinone | pyrogallol | metol |
--------+-------------+-------------+--------------+--------------+----------|
ferrous | dark blue/ | no reaction | no reaction | dark blue/ | no |
| purple | | | indigo | reaction |
--------+-------------+-------------+--------------+--------------+----------|
ferric | dark green | purple/grey | blue, turns | dark red/ | no |
acidic | later black | faint color | yellow/brown | brown, later | reaction |
| | | quickly | brown | |
-----------------------------------------------------------------------------