Chapter 20 Laboratory: Quantitative Analysis 359RQEWEvI UESTIOnS
q 1 : How closely did the mass of vitamin C that you determined experimentally correspond to the nominal mass of vitamin C listed
by the manufacturer?
q: 2 What percentage of the tablet’s mass is vitamin C and what percentage of its mass is binder and other inert ingredients?
q: 3 Ascorbic acid and atmospheric oxygen can react spontaneously by the following redox reaction:
2 C 6 H 8 o 6 (s) + o 2 (g) ↔ C 6 H 6 o 6 (s) + 2 H 2 o(l)If this reaction occurred before you completed the titration, how might it affect your results?q: 4 When chemists use titration for quantitative analysis, they ordinarily repeat the titration several times. Why?