4
          
          KI
          +
          2
          
          
            CO
            
              2
            
            
              
            
          
          +
          
            O
            
              2
            
            
              
            
          
          ⟶
          2
          
          
            K
            
              2
            
            
              
            
          
          
            CO
            
              3
            
            
              
            
          
          +
          2
          
          
            I
            
              2
            
            
              
            
          
        
      
    
    {\displaystyle {\ce {4 KI + 2 CO2 + O2 -> 2 K2CO3 + 2 I2}}}

Inorganic chemistry
Since the iodide ion is a mild reducing agent, I− is easily oxidised to iodine (I2) by powerful oxidising agents such as chlorine:

  
    
      
        
          2
          
          
            KI
            
              
                (
                aq
                )
              
            
            
              
            
          
          

          
          +
          
            Cl
            
              2
              
                (
                aq
                )
              
            
            
              
            
          
          ⟶
          2
          
          
            KCl
            
              
                (
                aq
                )
              
            
            
              
            
          
          

          
          +
          
            I
            
              2
              
                (
                aq
                )
              
            
            
              
            
          
        
      
    
    {\displaystyle {\ce {2 KI_{(aq)}{}+ Cl2_{(aq)}-> 2 KCl_{(aq)}{}+ I2_{(aq)}}}}
  This reaction is employed in the isolation of iodine from natural sources.
Due to its high potassium content, SSKI is extremely bitter, and if possible it is administered in a sugar cube or small ball of bread. It may also be mixed into much larger volumes of juices. Neither SSKI or KI tablets form nutritional supplements, since the nutritional requirement for iodine is only 150 micrograms (0.15 mg) of iodide per day. Thus, a drop of SSKI provides 50/0.15 = 333 times the daily iodine requirement, and a standard KI tablet provides twice this much. See also
Elephant toothpaste

References
External links
"Potassium iodide". Drug Information Portal. U.S. National Library of Medicine. World Health Organizations guidelines for iodine prophylaxis following a nuclear accident