The same technique is repeated for oxygen, using the pyrogallol solution, and carbon monoxide using the ammoniacal cuprous chloride solution.

Important to note that Orsat % give actual analysis on a dry basis. The common Orsal gives   and ,  is found by

Since KOH solution absorbs both contains the amount of as well.

Reporting of Orsat analysis

Consider combustion of coal with dry air. The ultimate analysis of coal (% dry basis) is C 76, H 5, O 6, N 2,S 2 and Ash 9. Assume complete combustion. Determine a) Stoichiometric amount of air, b) Amount of POC. c) % POC analysis (wet basis), d) % POC analysis (dry basis) and e)% POC analysis (Orsat).
Basis 100 Kg coal.  In the following the balance on the elements is done in kgmole.          
Amount of stoichiometric air

                                              


                              
                  
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