Na2S + 2 AgI → 2 NaI + Ag2S
Reactants:
- Na2S
- Names: Sodium sulfide

, Disodium sulfide 
, Sodium sulfide (anhydrous)
Sodium monosulfide
, Sodium sulphide 
- Appearance: Colorless, hygroscopic solid
; White-to-yellow hygroscopic crystals with characteristic odour 
- AgI
- Names: Silver iodide

, Silver(I) iodide 
, AgI 
- Appearance: Yellow, crystalline solid

Products:
- NaI
- Names: Sodium iodide

, Sodium iodide (anhydrous)
, NaI
, Sodium monoiodide 

- Appearance: White solid | deliquescent
; Colourless-to-white hygroscopic crystals or white powder. turns brown on exposure to air 
- Ag2S – Silver(I) sulfide, Silver sulfide

- Other names: Silver sulfide

, Ag2S
, Silver(I) sulfide 
- Appearance: Grayish-black crystal
