stoichiometry

[mel]

I need help...I did a lab with sodium bicarbonate. I added HCl to it and heated it until only NaCl was left. Now I have to find the percentage yield. I have the experimental mass of NaCl, but what is the theoretical mass of NaCl? :?:

[robin]

Figure out how many moles of sodium bicarbonate you started with. In theory you'll end up with the same no. of NaCl moles. From this calculate the theoretical mass of NaCl.

e.g. If you started with 1 mol sodium bicarb, in theory you'll end up with 1 mol of NaCl, of mass 58.5 g.

[KathChem82]

The balanced chemical equation for you question is

NaHCO3 + HCl ------> NaCl + H2CO3

This is how to get the theoretical amount of NaCl.

g NaHCO3(1 mol NaHCO3/84 g NaHCO3)(1 mol NaCl/1 mol NaHCO3)(58 g NaCl/1 mol NaCl) = theoretical yied of NaCl

Just substitute there the amount of NaHCO3 you used in the experiment. To get the % yield, divide the actual yield by the theoretical yield and multiply by 100.

I'm sure you'll get the right answer.

Cheers!