Lab 6D

Determining the Limiting Reactant and Percent Yield in a Precipitation Reaction.
The OBJECTIVES of this lab are to determine which of the reactants is the limiting reactant and which is the excess reactant; to determinr the theoretical mass of precipitate that should form; to compare the actual mass with the theoretical mass of precipitate and calculate.

The equipment we used in this lab is a little different form before, we use filtering apparatus and filter paper to filtrate the products.
There is a small tip when using filter paper: we'd better use water to wet the paper in order to let it accrete on the filtering qpparatus.
Chemical reagents we used in this lab are 25ml 0.70M sodium carbonate solution, Na2CO3 and 25ml 0.50M calcium chloride solution, CaCl2.

Na2CO3(aq) + CaCl2(aq) = 2NaCl(aq) + CaCO3 (s)
(CaCO3 is white solid)
0.7M * 0.025L*(1 mol NaCO3/1 mol CaCO3) * (100g/mol) = 1.75g CaCO3
0.5M * 0.025L*(1 mol CaCl2/ 1 mol CaCO3) *(100g/mol) = 1.25g CaCO3
Na2CO3 will be left!
So that after filtrate the solid is CaCO3, the solution is Na2CO3+NaCL

After measure, we find the product we get actually is 1.02g
% Yield = 1.02g/1.25g *100% = 0.82%