Answer Happy

Experimental Data Limestone Oyster Shell Mass of flask + acid 93.0092 g 99.12629 Mass of boat + sample 1.5872 0.78379 Mass of boat o. ?769 g 0.6774 g Mass of flask + acid + sample at 20 min 93.42 669 99,15539 Reactions Limestone CaCO (s) + MgCO (5) + 4 HCl(aq) + CaCl, (aq) + MgCl,(aq) + 2 CO (g) + H2O(1) Oyster Shell CaCO(s) + 2 HCl(aq) → CaCl,(aq) + CO2(g) + H, 0(1) Calculated Values Limestone Oyster Shell Mass of sample Initial mass of flask + acid + sample Mass of CO, lost at 20 min Moles of Co Moles of CO, Moles of Caco, Moles of MgCO Total mass of MgCO, + Caco, Mass percent (MgCO, +CaCO,) Mass of Caco Mass percent Caco

Part 2: The Hardness of Water Samples Experimental Data 0.01066M Concentration of EDTA Sample number Initial burette reading Final burette reading #2--Tap #4-Mineral #1 - Tap 35.2 39.71 29.71 42.60 #3-Mineral 42.60 45. So 32.00 44.46 Reaction M®"(aq) + EDTA (aq) → (MEDTA)(aq) where M = Caps and Mg? Calculated Values #1 - Tap #2-Tap #3-Mineral #4-Mineral Volume of EDTA used Moles of EDTA used Moles of Caco Mass of Caco, in mg Hardness of water sample