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小 發表於 2016-9-29 10:29 PM (第 2759 天)
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Dependent variable of vitamin C experiment
there is an experiment requires us to find out which brands of juice contain the highest amount of vitamin C
the method: adding DCPIP solution to different brands of juice (fixed volume) until the juice become colorless
so i wrote the dependent variable is: the volume of DCPIP solution added,
but the teacher said i was wrong
the correct ans should be: vitamin C content
anyone knows the reasons behind???
[ 本帖最後由 suking2014 於 2016-9-29 10:31 PM 編輯 ]