Lab 6: Mole-Mass Relationships

The purpose of this lab was to apply our skills that we had learned about mole-mass relationships earlier in the day, specifically the formulas that came along with it (i.e. turning the mass to moles and vice-versa), in a situation where using them worked to our benefit.

1. NaHCO3 was the limiting factor because you had a range of mL that you could use for the acid (the max was 15 mL), but you couldn't abandon the fixed mass of NaHCO3 that you had.

(Questions #2-#4)

Looking at number 4, the percent yield is 143%. Obviously, there is some error here, as the percent yield shouldn't ever pass 100%. The reason for this error would probably be the equipment that we used to contain the acid + NaHCO3. Since the acid ate through the evaporating dish that we were going to use, we had to use a beaker. And since the beaker is less open than an evaporating dish, not all of the water was able to get out. So, as a result, the percent yield includes the solid and some lingering water particles, and not just the solid.