Limiting Reagents

Lab #3/Limiting Reagents

Abstract
The purpose of this laboratory try out was to determine whether an unfathomed compound was sodium change or sodium hydrogen carbonate by reacting a experiment of it with hydrochloric acid and comparing the resulting retort of NaCl to the calculated values. The crapper of an evaporating peach tree was taken at the start of the experiment. Then the unknown carbonate A was added in the amount of approximately one gram. The disc was weighed erstwhile more to find the definite mass of the unknown carbonate. Then, by means of a dropper bottle and soul-stirring rod, hydrochloric acid was added until all of the unknown carbonate appeared to have reacted. On a ring stand with a bunsen burner the HCl was evaporated, difference only the NaCl. After cooling, the mass of the serve up was taken once more. The mass of the left over NaCl was compared to the predicted yields to determine what the original carbonate was exactly. There was a high possibility for error in this experiment because the NaCl could not be heated a consequence time to make sure all of the HCl was evaporated. The final mass of the NaCl was 1.4 grams. This number is closer to the expected yield for Na2CO3 than the one for NaHCO3, just it is greater than either. Because it is impossible to have a greater than atomic number 6 percent yield, it is likely that the HCl was not completely evaporated.





Results
Evaporating dish = 44.3 grams
Evaporating dish with unknown carbonate A = 45.4 grams
Unknown carbonate A = 1.1 grams
NaHCO3 + HCl ? CO2 + NaCl + H2O
.754 grams of NaCl predicted yield
Na2CO3 + 2HCl ? CO2 + 2NaCl + H2O
1.16 grams of NaCl predicted yield
Evaporating dish with NaCl after drying = 45.7 grams
NaCl after drying = 1.4 grams unquestionable yield
At least 120% yield
At least 20.7% error

Conclusion
The essential yield was more than 100 percent of the greater predicted yield and an even higher percentage of the lesser predicted yield. This means that close likely not all of the hydrochloric...If you want to get a full essay, order it on our website: Ordercustompaper.com



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