lab 5z - Zachary Kmieciak Mr Song and Prof Paul Chemistry...

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Zachary Kmieciak Mr. Song and Prof Paul Chemistry Lab 8 AM October 3, 2006 The Calcium in Milk Introduction The goal of this lab is to determine the amount of calcium in 2% and skim milk. Each type of milk will contain different amounts of calcium. A calcium indicator will turn the solution pink, and green if excess calcium is present. KOH is used to raise the Ph to over 13. Results and Discussion In order to determine the calcium content in the 2% milk, we must first calculate the molarity of the EDTA used in the experiment. In order to do so, we must use the equation M EDTA = M(Ca 2+ ) x V(Ca 2+ ) / V EDTA . M(Ca 2+ ) = .03 [mol / L] V(Ca 2+ ) = 4.66 ml .03 x 4.66 / 5 = M EDTA V EDTA = 5.0 ml M EDTA = .028 [mol / L] Next, the moles of EDTA started with were found by multiplying the molarity of EDTA from above by the volume of EDTA used. The equation is Moles EDTA = M EDTA x V EDTA .
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M EDTA = .028 [mol / L] Start Moles EDTA = .028 x .01 V EDTA = .01L Start Moles EDTA = 2.8 x 10 -4 mol Next, we must calculate the excess amount of EDTA. The necessary operations are to
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