In this lab we worked with limiting and excess reagents. In these types of reactions we are able to tell which reactant will run out first. In this particular experiment we worked with copper(III) nitrate and potassium iodide to find out what the limiting and excess reagents are. To calculate the efficiency of a reaction, chemists calculate the percent yield, using the actual yield and the theoretical yield. The actual yield tells us how much product you get after carrying out the reaction. The theoretical yield is the calculation of the quantity of product actually obtained. This ratio tells us how efficient the reaction was. Precipitation is the formation of an insoluble solid in a solution. We use a centrifuge to better separate the liquid and solid in the test tube. The centrifuge spins the test tubes at high speed, which causes them to separate and makes the liquid less cloudy. To separate the liquid and solid we extract the supernatant using a pipette and extract the liquid being careful not to disturb the precipitate. The objectives of this experiment were to determine the lim...