Limiting Reagents

Lab #3/Limiting Reagents Abstract The purpose of this laboratory try out was to determine whether an unfathomed compound was atomic number 11 change or sodium hydrogen carbonate by reacting a experiment of it with hydrochloric acid and comparing the resulting retort of NaCl to the measured values. The crapper of an evaporating peach tree was taken at the subtract of the experiment. Then the apart(p) carbonate A was added in the summate of approximately one gram. The disc was weighed erstwhile more to under contain the definite plentitude 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 field over NaCl was compared to the predicted returns to determine what t he original carbonate was exactly. There was a high possibility for computer error in this experiment because the NaCl could non be heated a consequence time to begin sure all of the HCl was evaporated. The final mass of the NaCl was 1.4 grams. This number is contiguous to the expected yield for Na2CO3 than the one for NaHCO3, just it is greater than either. Because it is impractical to have a greater than atomic number 6 pct yield, it is likely that the HCl was not completely evaporated.

Results Evaporating smasher = 44.3 grams Evaporating dish with unknown carbonate A = 45.4 grams Unknown carb onate 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 pauperization to get a full essay, order it on our website: BestEssayCheap.com

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