[UFpball7]

well you helped me earlier so ill try to return the favor. as a chemical engineer i am pretty familiar with titrations. basically there are 2 ways to do them. one is with the ph meter discussed above or you can use a color indicator. the object is to get as close to the equivalence point as you can(add titrant very slowly near end point). the concentration of your titrant must be know. since you are titrating sulfuric acid(H2SO3) you must be carefull when calculating the concentration since it will dissociate into 2 hygrogen ions. if you are using NaOH to titrate it will create 1 OH ion.this reaction is 2:1 stoichiometry. if the aluminum you wish to tritrate is in the same solution this will make things more complicated since the NaOH will react with the aluminum to produce aluminum hydroxyed. this will precipated out of the solution as the solution becomes less acidic. it is hard to cover all the details on a forum. after all it took me an entire semester for it. if you have any questions hopefully i can help.