Objectives? To observe the double replacement reaction, determine which is the limiting reactant and which is excess, determine the theoretical mass of precipitate & compare the actual mass with the theoretical mass and calculate percent yield!Safety first! Put on your safety goggles/glasses!
Obtain the sodium carbonate solution and calcium chloride solution. Pour the contents into a large graduated cylinder and observe! Let it sit for about 5 minutes. While waiting...
Set up the ring stand with the funnel. Get the filter paper, write your name on it, and weigh it. Then fold the filter paper so it fits inside the funnel and place it inside.(Don't know how to fold the filter paper? Just follow the picture.) Place a graduated cylinder underneath the funnel. Now, swirl the beaker with the contents and now slowly pour some of the solution into the funnel. Do it in stages. It will take some time...tick tock tick tock. After filtering is finished, remove the filter paper and place it on a folded paper towel and let it dry. The next day we will weigh and record the mass of the dry filter paper.So what happened in this lab? A double replacement reaction occurred!
1 Na2CO3(aq) + 1 CaCl2(aq) --> 2 NaCl(aq) + 1 CaCO3(s)
With this information, you can use stoichiometry to determine which is limiting and which is excess. Then you can predict how much precipitate was formed.
To calculate the percent yield next class, this formula will be used:
Percent Yield= actual mass produced (grams) x 100
theoretical mass produced (grams
Precipitation Reactions occur when cations and anions of aqueous solutions combine to form an insoluble ionic solid, called a precipitate. I am learning these concepts for my boards exam.
ReplyDelete