[pajarita]

I weigthed 3 samples of X compund which i know percent of pureness (sorry i know correct terms in spanish) and molar mass. Then i tritrated each sample with the substance Y i want to know it's concentration (and i know the reaction that takes place).

This is what i was doing but got slightly different concentrations (i'm guessing i'm supposed to get same concentration for substance Y??).

(impure grams of X)(pure grams X/impure grams X)(1 mol X/ __g X)(1 mol Y/1 mol X) then i divided Y mol with Liters needed to consume X. In all of them i get something similar to: .112, .116, .117

Is that right? Am i missing something? Do i need to know the stecheometry of the reaction?

[LQ43]

Is that right? Am i missing something? Do i need to know the stecheometry of the reaction?

Yes it looks right but only if 1 mol Y = 1 mol X. Yes you need to know the stoichiometry of the reaction.

[Borek]

This is what i was doing but got slightly different concentrations (i'm guessing i'm supposed to get same concentration for substance Y??).

They should be close, but not identical because of experimental errors.

[pajarita]

Yes 1 mol X = 1mol of Y, oh but that is the stoichiometry of the reaction isn't it? I was thinking of equivalence point and other things. Thank you very much