Stoichiometry Lab

Purpose: Determine the percentage yield of a double replacement reaction

Procedure: 

1) Mass evaporating dish

2) Mass 2g Na^2CO^3 

3) Add HCL slowly until bubble stops

4) Heat until all water has evaporated

5) Mass NaCl

6) Balance the equation

Data:

Mass of evaporating dish: 46.54g

Mass of Sodium Chloride: 2.00g

Mass of NaCl: 1.67g

Calculations:

Balanced Equation: Na2CO3+2NaCl+CO2+H2O

Theoretical Yield of NaCl: 

2g Na2CO3->.0189 mol Na2CO3->.0377 mol NaCl->2.2g NaCl

Percent Yield:

1.67g/2.21g x100=75.57%yield

Conclusion:

In this lab a chemical reaction produced saltwater which was then evaporated to find the mass or yield of salt. There was significant error because the amount in the lab was only 75.57% of the theoretical yield in this equation. The error may have occurred since when heated the compound began spitting and popping, which propelled some salt out of the evaporating dish.