SUSB 17_0002 - “”44 iiilii Complexometric Titration of...

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Unformatted text preview: “”44 uuuuuuuuuuuuuuuuuuuuuuuu iiilii, Complexometric Titration of Calcium in Antacids [Pre—laboratory Questions] Name Date Course/Section EDTA titration can be used to determine the “hardness" of water. “Hardness” is due principally to the presence of calcium and magnesium ions in water. Their presence Leads to precipitation of soap scums from soaps, and precipitation of calcium carbon— ate on heating the water, as in tea kettles or industrial boilers, through the reaction: Ca2+ + 2 Hco; —> CaC03(s) + H20 (i) + COZ(g) in order to determine the concentration of calcium ion in tap water, Spring Wawda unrated a 250.0 mL sample of tap water with 00500 M EDTA solution, following the procedure of SUSB-017. The volume of solution required to reach the endpoint was 25.84 mL. 1. How many mmoles of EDTA were used in this titration? is: How many mmoles of calcium ion [Ca2+] were present in the water sample? SJJ How many mmoles of CaCO3 would precipitate upon heating a 500 mL sample of this water? 4‘ How many grams of calcium carbonate is this? EJI Marble is essentially pure calcium carbonate. What will happen if you spill Vin- egar on a marble countertop? 69 ...
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