Illustrated Guide to Home Chemistry Experiments

(Amelia) #1

364 DIY Science: Illustrated Guide to Home Chemistry Experiments


RQEWEvI UESTIOnS


q 1 : How closely does your experimental value for the mass percentage of sodium hypochlorite in the chlorine bleach
sample correspond to the mass percentage on the label? Give at least three possible sources of error that might explain
any discrepancy.


q: 2 How would you modify the procedure in Part II to determine the sample size gravimetrically rather than
volumetrically? What advantage or advantages would substituting a gravimetric procedure confer?


q: 3 Why did we use back titration rather than forward titration for this quantitative analysis?

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