- #1
FaNgS
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Yield gone wrong!
Hi, I just have a question about some practical things in a chemistry lab and errors.
:uhh:
We carried out a recrystallization experiment of benzoic acid and napthalene :zzz: last week and during one of the steps where i was supposed to transfer my pure sample of benzoic acid from a 5mm calibrated test tube onto a filter paper and dry in an electric oven to weigh the mass obtained and calculate the %yield (all of the apparatus used is for macroscale organic chemistry experiments...oh i forgot to mention that this is an organic chemistry experiment, unless its obvious :tongue2: ) i forgot to measure the mass of the filter paper itself and it seems that the filter papers have quite big differences in mass...my friend recorded a filter paper mass of 0.766g
so now all i have is the weight of the pure benzoic acid and filter paper which is 0.879g...so i can't find the mass of pure benzoic acid now since i don't know the weight of the filter paper and hence can't calculate the yeild.
my question is if there is any method to obtain the mass of my filter paper? is it a good idea to measure the mass of a few filter papers and take the average of them and use that value?
fyi i started with 0.103g of impure benzoic acid :shy:
thanks :)
Hi, I just have a question about some practical things in a chemistry lab and errors.
:uhh:
We carried out a recrystallization experiment of benzoic acid and napthalene :zzz: last week and during one of the steps where i was supposed to transfer my pure sample of benzoic acid from a 5mm calibrated test tube onto a filter paper and dry in an electric oven to weigh the mass obtained and calculate the %yield (all of the apparatus used is for macroscale organic chemistry experiments...oh i forgot to mention that this is an organic chemistry experiment, unless its obvious :tongue2: ) i forgot to measure the mass of the filter paper itself and it seems that the filter papers have quite big differences in mass...my friend recorded a filter paper mass of 0.766g
so now all i have is the weight of the pure benzoic acid and filter paper which is 0.879g...so i can't find the mass of pure benzoic acid now since i don't know the weight of the filter paper and hence can't calculate the yeild.
my question is if there is any method to obtain the mass of my filter paper? is it a good idea to measure the mass of a few filter papers and take the average of them and use that value?
fyi i started with 0.103g of impure benzoic acid :shy:
thanks :)