LAB 6D

Lab 6D - Determining the limiting reactant and percent yield in a precipitate reaction

Material and Equipment, Procedure can both be found in page 71-72 in the Lab Book

Observation:

• both solutions staarted out as clear liquids
• when poured into the beaker, they turned into a white precipitate instantly
• product being produced from the filter is a clear liquid
• precipitate is clinging to the filter
• after the filtering process was completed, a thin layer of CaCO3 was left

Analysis of Result:

• CaCl2 is the limiting reactant
• the theoretical mass is 1.2g
• actual mass is 1.16g
• percent yield is 93%

Conclusion:
the reaction between Na2CO3 and CaCl2 was observed and recorded.  The limiting and excess reactants, including the theoretical mass of precipitate that should form were determined.  As well, the percent yield was calculated.
The uncertainty of the centigram balance may affect the result, and things in the air may stick to the filter paper and affect the mass.  It's not a closed, isolated system.
the percent yield is not perfect because it is not under a perfect condition.  Not all the reactants involved in this reaction and some products may be lost.