Ferrous Ammonium sulfate was used as a standard for iron in the absorbance
experiment in lab.  The stable solid weighing form has the formula Fe(NH4)2(SO4)2
Q6H2O. 
Write all the charge- and mass-balance equations for a 0.050 M aqueous solution of
“ferrous ammonium sulfate” as written above. 

Remember that the ammonium ion is the
conjugate acid of a weak base.  In addition, while the first proton on sulfuric acid ionizes
completely, the second proton does not.  Technically, the bisulfate ion, HSO4−, is a “weak
acid” and there is a measurable Ka2