Egg Shell Lab

Michelle Fishman Period 11 TCA 3 TITLE musket b solely Shell Lab OBJECTIVE To determine and compare the bill of calcium carbonate content of brownish and white bollock ticktocks. MATERIALS white and brown eggshells, water, deionized water, beaker, pipet, flask, experiment tube brush, funnel, hotplate, mortar, pestle, ethanol, HCl, phenolphthalein indicator, atomic number 11 hydroxide PROCEDURE (Comp permite for both white and brown eggshells) 1. Get iodine egg and beaker and bring it to your lab station. 2. Break the egg into a beaker. 3.Add water to the egg and stir before you pour it stilt the drain. 4. lap the shell with deionized water and peel off the membranes from the inside of the shell. prohibitionist your eggshell and put into a labeled beaker. 5. Wash your hands. 6. Dry the shell for about 10 minutes in the oven. 7. Grind the shell to a fine powder with a mortar and pestle. 8. Weigh between 0. 450 and 0. 550 grams of dehydrated shell into each of the 3 labeled 2 50mL flasks. 9. Make convinced(predicate) to get into the exact mass of the shell in each flask. 10. Add a few drops of ethanol to each flask. 1. Pour 40 mL of 1. 0M HCl into a beaker. 12. Put 10. 0 mL of the 1. 0M HCl to each 250mL flask containing the eggshells. Whirl the flasks to take form sure all of the solids get wet. Be sure to spill any extra HCl into the sink with water. 13. On a hotplate, heat the bases in the 250 mL flasks until they boil and then wait for them to cool. Be careful not to let them boil dry. Rinse flask with water. 14. Carefully, add 3-4 drops of phenolphthalein indicator to each flask. 15. victimisation a funnel, fill a buret partly with 0. 00 M sodium hydroxide, to rinse it. Empty the buret into the sink. Then, pour NaOH solution into the buret merely above the top mark. Spill out several(prenominal) excess solution to remove all of the bubbles from the top. If there is not enough solution, refill some more into the buret. Read and record the ini tial volume to 0. 01 mL. 16. Add one sample to the first pink color. The color will fade formerly you are close to the endpoint. Add the excess NaOH subaltern by little with a dropper pipet until the color is constant for at least 30 sec.Read and record the final volume to 0. 01 mL. Once the volume is added, it is the diversity between the initial and final readings (to 0. 01 mL) 17. Repeat for the other samples. 18. Calculate the fair value and the percent calcium carbonate in each sample. 19. Wash the egg residue out of the flask. CONCLUSION QUESTIONS 1)The amount of eggshell a student uses changes the outcome of the lab. It does matter because calcium may be unequally distributed throughout the shell and there may be different concentrations or so the eggshell.If the student doesnt add a certain amount of eggshells, the experiment will not have the correct outcome. 2)A student would be sure they added a sufficient amount of acid to completely react with all of the calcium carbonate by making the proper measurements. If there is not enough chemical activity like fizzing for example, the student enkindle adjust the amount by adding more acid to make a greater reaction. 3)If the student failed to add sufficient HCl, it would affect their data in many ways.Insufficient amounts oh HCl would not produce a complete reaction. The uneven amount would cause the reaction with CaCO3 to be unequal, so all the results would be instantly affected. BIBLIOGRAPHY 1) CHEM 1102. Eggshell Experiment. N. p. , n. d. Web. 17 Mar. 2013. 2) CHEM-212 Eggshell Lab. CHEM-212 Eggshell Lab. N. p. , n. d. Web. 17 Mar. 2013. 3) Stoichiometry. Chem4Kids. com Reactions. Andrew Rader Studios, 1997-2012. Web. 19 Mar. 2013. 4) To cast the Percentage by Mass of Calcium Carbonate in Eggshells