Determining the Mass of Calcium Ion in a Calcium- Enriched Tablet In this lab, we dissolved a calcium-enriched tablet and participate the calcium ion as calcium carbonate. Our purpose is to determine the masses of calcium carbonate and calcium ion, to determine the mass percent of calcium ion in the tablet and to compare the masses and the percent with the listed tablet ingredients.
This time we used a mall beaker, analytical balance, forceps, a ml graduated cylinder, a glass rod, beaker tongs, a hot plate, two 16 x 125- mm test tubes, centrifuge, a medicine dropper, a filter paper, a filter funnel, a 250-ml Erlenmeyer flask, a watch glass, a drying oven, a spatula and a red litmus paper. The chemicals we need were ml of 2. MM HCI, a calcium-enriched tablet and ml of 1. MM Niacin solution. At the very beginning we weighed the calcium-enriched tablet and the weighing paper, after recording the masses, we deed the hydrochloric solution to the beaker with the calcium tablet in it.
The calcium dissolved really quickly and there were bubbles and foams formed. We then heated the beaker with a hot plate for 2 to 3 minutes, equally distributed the supernatant solution into two test tubes, but avoid pouring the solid. After centrifuging the samples, we added extra HCI solution into the test tubes, there wasn’t any bubbling occurs, so we could continue and put the mixtures into the centrifuge again. And then put the NAACP solution into the beaker and wait to low the Cacao precipitate to form.
We then tested whether the supernatant solution is still acidic with a piece of red litmus paper, filter the liquid and we had some Cacao. Dried the filter paper and Cacao in the oven, then we broke the Cacao into small particles with a glass rod, and dried it one more time. Let it cool and repeat heating, cooling and weighing it until the masses differ between two results are less than 0. Egg. The percent yield is 25%, which is really off. That happened because while we were centrifuging the solution, one of the est.. Tubes broke and we lost half of the solution.
Therefore we lost about half of the calcium carbonate. Also, when we were filtering the supernatant liquid, we forgot the funnel so there was a lot of liquid coming out of the flask. We then lost more calcium carbonate. Since after the second heating, the masses differ were less than 0. Egg, so we didn’t need to heat and weigh one more time. From this experiment, we learned how to precipitate calcium ion from a calcium-enriched tablet by using hydrochloric acid and sodium carbonate.