Oxidation of ethanol
using acidified potassium dichromate (VI)
The oxidation of
ethanol to ethanoic acid using acidified
potassium dichromate (VI) K2Cr2O7
is an example of a redox reaction.
The half equation for the reduction of the dichromate (VI) ions (in an orange solution) to chromium (III) ions (green solution) is
The half equation for the reduction of the dichromate (VI) ions (in an orange solution) to chromium (III) ions (green solution) is
6e- +
14 H+ + Cr2O72-
→ 2 Cr3+
+ 7 H2O(g)
a) There is a gain
of
electrons
for the
dichromate (VI) ions
b) The oxidation number / state of the dichromate (VI) ions +6; and it has been reduced to +3 (the chromium (III) ions).
b) The oxidation number / state of the dichromate (VI) ions +6; and it has been reduced to +3 (the chromium (III) ions).
Share this page via Whatsapp
Pengoksidaan
etanol kepada asid etanoik menggunakan larutan kalium dikromat
(VI) berasid merupakan contoh tindak balas
redoks.
Persamaan separuh penurunan ion dikromat (VI) (larutan jingga) ke ion kromium (III) (larutan hijau) adalah seperti berikut
Persamaan separuh penurunan ion dikromat (VI) (larutan jingga) ke ion kromium (III) (larutan hijau) adalah seperti berikut
6e-
+
14 H+ + Cr2O72-
→
2 Cr3+
+ 7 H2O(g)
a) Ion dikromat (VI) menerima elektron dan diturunkan.
b) nombor pengoksidaan ion dikromat (VI) +6 diturunkan kepada +3 bagi ion kromium (III)