3 H2SeO3 + CsOH → H2O + CsH5(SeO3)3
Reactants:
- H2SeO3 – Selenous acid


, Selenic(IV) acid 
- Other names: Selenious acid


, [SeO(OH)2]
, Selenige Säure
, Monohydrated selenium dioxide 
- Appearance: White hygroscopic crystals
; Colourless hygroscopic crystals 
- CsOH
- Names: Caesium hydroxide

, Cesium hydrate 


, Cesium hydroxide 

Cesium hydroxide dimer 
, CsOH
, Caesium hydrate 
- Appearance: Whitish-yellow deliquescent crystals
; Colourless-to-yellow hygroscopic crystals
; Colorless or yellowish, crystalline solid. [Note: Hygroscopic (i.e., absorbs moisture from the air).] 
Products:
- H2O – Water, oxidane

- Other names: Water (H2O)
, Hydrogen hydroxide (HH or HOH)
, Hydrogen oxide
Dihydrogen monoxide (DHMO) (systematic name)
, Hydrogen monoxide
, Dihydrogen oxide
, Hydric acid
, Hydrohydroxic acid
, Hydroxic acid
, Hydrol
, Μ-oxido dihydrogen
, Κ1-hydroxyl hydrogen(0) 
- Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

- CsH5(SeO3)3