Experiment 1 the effect of pH on a food preservative Introduction: The purpose of the lab was to understand and familiar with the laboratory environment and some fundamental operation such as measuring mass, volume; calculating density and separating solid from liquid by vacuum filtration. In the lab, we used sodium beneath and react with Hydrochloric acid to form benzene acid. There were two steps involved in the experiment, reaction and separation.
After the steps were completed, we measured the product and the percentage yield and compare the actual yield with the theoretic yield. Cinchona + HCI COACH+ H2O Procedure and Observation The procedure of the experiment is listed on the handout. In the experiment, we performed with microscope instead of a standard scale. At first, we obtained 0. Gram of sodium beneath to a ml vial. Next, we measured 3 ml of water into the vial and stir with a thin glass until the sodium beneath dissolved.
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Then we measured Mil of HCI and putted into vial slowly and dry it with vacuum filtration and measure the weight of the product. During the experiment, I saw the reactant change from colorless to milky cloudy solid and there were some door released Data and results Part A Mass of sodium beneath 0. Egg Volume of water ml Volume of MM HCI 0. Ml Actual yield 1. Egg Theoretical yield 0. Egg Calculation of Theoretical yield: N gram of sodium beneath/ 144 gram per mole of sodium beneath= 0. Ml/ 1000 volume of HCI*3 Military of HCI Gram of sodium beneath is 0. 3672 Percentage Yield = 1. 03/0. 3672 x 100% = 280% part B Solvent Volume(ml) Mass Density Absolute ethanol 0. 25 0. 228 0. 912 0. 5 0. 432 0. 864 0. 75 0. 635 0. 847 1. 0 0. 840 Discussion In the percentage yield is 280 % which is more than it supposed to be, which significantly more that theoretical value is. The cause of error are mainly due to drying of the product.
In the experiment, we used vacuum filtration and the power of the vacuum filtration is not strong enough and it does not take enough time to dry the product before measuring in the weight balance. Therefore, actual yield is more than theoretical yield. Conclusion Overall the experiment deems to be successful due to successful obtain benzene acid from sodium beneath. However, the only improvement is to take more time to do the filtration or use higher power of vacuum before measuring product.