Silver Chloride Photodecomposition
2AgCl → 2Ag + Cl2
Aperçu
Silver chloride darkens upon exposure to light as photons provide enough energy to reduce Ag⁺ to metallic silver. This photosensitivity of silver halides is the fundamental chemistry behind traditional photography. The released chlorine atoms combine to form Cl₂ gas.
Participants
| Rôle | Substance | Coefficient | État |
|---|---|---|---|
| Réactif | Silver Chloride AgCl | 2 | (s) |
| Produit | Silver Ag | 2 | (s) |
Exemple du quotidien
Traditional black-and-white photography relied on this reaction — light hitting AgCl-coated film created a latent image of metallic silver.
Importance industrielle
Silver halide photography dominated imaging for 150 years. AgCl is still used in photochromic lenses that darken in sunlight.
Propriétés
- Type
- Photochemical
- Réversible
- Non
- Énergie
- Endothermique
- ΔH
- 254,0 kJ/mol
Réactions associées
Cis-Trans Isomerization of Retinal
Luminol Chemiluminescence
Firefly Bioluminescence (Luciferin Oxidation)
Photolysis of Water (Vacuum UV)
Photochemical Smog Formation (NO₂ Photolysis)
Photodegradation of Methylene Blue by TiO₂
Photodissociation of Chlorine Gas
Silver Bromide Photodecomposition
Photosynthesis
Chlorophyll Fluorescence
Frequently Asked Questions
What is the equation for Silver Chloride Photodecomposition?
The balanced equation is: 2AgCl → 2Ag + Cl₂.
What type of reaction is Silver Chloride Photodecomposition?
Silver Chloride Photodecomposition is a photochemical reaction.
Is Silver Chloride Photodecomposition exothermic or endothermic?
Silver Chloride Photodecomposition is endothermic (absorbs energy). The enthalpy change (ΔH) is 254.0 kJ/mol.