1. SILVER MIRROR FORMATION OXIDATION- REDUCTION (REDOX) REACTIONS
1) theory:
OXIDATION- REDUCTION (REDOX) REACTIONS
2) experIMENT:
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Take 1.0 ml NaOH(s) and add 10ml H2O to prepare %10 NaOH(aq)
Chemicals:Ammonia, 10% Sodium Hydroxide, 5% Silver Nitrate, Acetaldehyde, Acetone
Take 0.5 g AgNO3(s) and add 10ml H2O to get 5% AgNO3(aq). Shake it to get homogeneous solution
CH3CHO + 2 Ag(NH3)2OH → CH3COO(NH4) + 2 Ag(s) + 3 NH3 + H2O
Figure: Schematic representation of oxidation-reduction reactions
Add dilute NH3
dropwise with shaking until brown precipitate dissolves. Finally, add acetaldehyde and observe Ag mirror
Redox reactions are a relatives of reactions which are defined as the transfer of electrons between species. Oxidation refers to the loss of electrons, whereas reduction refers to the gain of electrons.
Ag+ (aq) e- → Ag (s)
Ag(s) + 2NH3→ Ag(NH3) e-
Interestingly, you will form Ag mirror from glucose (sugar) as the structure of glicose is aldehyde.
However, ketones like acetone do not give positive result with this experiment (no formation of Ag mirror).Aldehydes and ketone can be separated by this way.
Take 2 ml of the 5% AgNO3 solution into the test tube by graduated pipette
Add one drop of %10 NaOH(aq) and mix. The brown precipitate is observed
EDA ÇAĞLI
/ CHED

2. References
Techniques and experiments for organic chemistry. (2006). Middle East Technical University. Aldehydes and Ketones (pp ). Ankara: METU Press
National Resource for Computational Science Education. (n.d.). Redox reactions. Retrieved from
Test for Aldehydes and Ketones. (n.d.). Retrieved Dec 9, 2009, from
Micron Technology Foundation. (2003). Deposition. Retrieved Dec 9, 2009, from