Please help, I have been trying to figure this out for some time:

For a lab I dissolved Calcium chloride with sodium carbonate each in water, then poured them into a funnel and filtered out a white pigment. I need to calculate the percent yield, but what is the white pigment. Is it calcium carbonate, sodium chloride, or something else?

The white precipitate, insoluble in the solvent, is calcium carbonate. The NaCl is soluble, CaCl2 is soluble, and Na2CO3 is soluble.

ok thank you with that part, but I still don't understand how I find the percent yield

You should have dried the precipitate (ppt) and weighed it. I don't know how carefully the experiment was controlled but I would have weighed the paper first so I could subtract the mass of the paper from the mass of the paper+ppt. At any rate, this gives you the ACTUAL yield.

The theoretical yield is calculated from stoichiomtery.
Na2CO3 + CaCl2 ==> 2NaCl + CaCOO3.

I assume you know how much Na2CO3 OR how much CaCl2 you started with. Either a weight of one or both or a molarity and volume of one or both. CaCulate the theoretical yield from that, then
percent yield = (actual yield/theoretical yield)*100

thanks

To determine the white pigment obtained from the reaction between calcium chloride and sodium carbonate, you can make an educated guess based on the reactants involved. In this case, calcium chloride (CaCl2) and sodium carbonate (Na2CO3) undergo a double-displacement reaction, which can be represented by the following balanced chemical equation:

CaCl2 + Na2CO3 -> CaCO3 + 2NaCl

Based on the equation, the reactants (calcium chloride and sodium carbonate) combine to form product(s), including calcium carbonate (CaCO3) and sodium chloride (NaCl). Calcium carbonate is a white, insoluble solid commonly known as calcite or limestone. Sodium chloride, on the other hand, is a white, crystalline compound known as table salt.

Considering this information, it is highly likely that the white pigment obtained from the reaction is calcium carbonate (CaCO3). However, it is always important to confirm the identity of the white pigment through additional analysis techniques, such as spectroscopy or elemental analysis.

To calculate the percent yield of the reaction, you need to know the amount (in grams) of the white pigment obtained and compare it to the theoretical yield. The theoretical yield is the amount of product that should be obtained based on stoichiometry and assuming complete conversion of the reactants. To calculate the percent yield, use the following formula:

Percent Yield = (Actual Yield / Theoretical Yield) x 100

To obtain the actual yield, you would need to measure the mass of the white pigment obtained in the lab experiment. The theoretical yield can be calculated based on the stoichiometry mentioned in the balanced equation.