A .307 gram smaple of an unknown triprotic acid is titrated to the third equivalence point using... 35.2 mL of .106 M(molar) NaOH. Calculate the Molar Mass of the acid

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Hello! :)

 

To answer this problem, we need to write a chemical equation for the titration of the triprotic acid.

we let the triprotic acid be H3A  

H3A + NaOH    --->  H2A- +  Na+  + H2O

H2A- + NaOH   ---> HA2- + Na+ + H2O

HA2- + NaOH  ---> XA- +  Na+  + H2O

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H3A  + 3NaOH  ----> Na3A + 3H2O     this will be our working  

                                               ...

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