# Experiment 8 Limiting Reactant

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Limiting Reactant (Experiment #8) CHM 1045L Lucy Garcia Misturah Abdulkareem, Alexander Gonzalez, Oluseun Fajimolu Dr. Abuzar Kabir Purpose/Abstract The purpose of this lab was to determine the limiting reactant in a mixture of to soluble salts and the percent composition of each substance in a salt mixture. Procedure/Method First, we were to measure and record the mass of a beaker, then transfer about 1 gram of the salt mixture into the beaker, measure, and record the combined mass. Then, we had to fill a 400-ml beaker with deionized water and test it to make sure that the ph was just basic. We then combined the deionized water and salt by adding about 150ml of the deionized…show more content…
We then proceeded in testing for excess Ca2+ by adding two drops of .5 M K2C2O4 to test tube two and attentively observed to see if a precipitate formed, which it did. This meant that Ca2+ was in excess and C2O42- was the limiting reactant in the original salt mixture. We then cleaned up. Upon returning to our next class, we took the filter paper, with the precipitate on it, and took its mass. Pre-Lab Questions (Please see Attached) Results a. Result table (Please see attached) b. Calculation To calculate the percent by mass, we are to take the mass in grams of a particular salt and divide it by the mass in grams of the original sample, and then multiply it by 100. c. Formula and example of calculation Percent limiting reactant in salt mixture (%): (Mass (g) of salt mixture/ original sample (g))x 100= % (.367g/1.06g)x 100=34.6% DISCUSSION In this experiment, it is very important to ensure that the deionized water is just basic and not acidic in order to obtain accurate results. Calcium oxalate does not precipitate in an acidic solution because of the formation of H2C2O4-, an ion that does not precipitate with Ca2+ . Allowing the precipitate to settle is also very