# Prasenjit Saha Lab Report

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68th and Zinc Prasenjit Saha Chem lab 106 3/24/13 Spring 2014 Prasenjit Saha, Abdullah Sharif, Scott Wong I. Warmup Exercise 1: 1. 2.56g ZnI2/319.22 g ZnI2 .00802 mol ZnI2 2. .00802mol/0.500L0.0161 3.On the label of the flask I would write 0.0161 ZnI2/L Solution Exercise 2: Student 1: 0.43 g of ZnI2/319.22 g ZnI2 .001347mol ZnI2 .001347molZnI2/.0161M.084L84ml Student 2: .0005 mol ZnI2/ 0.0161M .031L31ml Exercise 3: a. 2.56 g ZnI2/500 mL b. 0.00512 g ZnI2/ml * 500ml = 2.56g ZnI2 c. 0.00806 moles of ZnI2/500 ml* 319.9 g ZnI2= 2.56 g ZnI2 d. 0.00806 moles of Zn/.5 L * 319.9g ZnI2= 2.56g ZnI2 *note:500 mL =0.5 L e. (0.0161M of ZnI2 * .5L) * 319.9g…show more content…
Focus questions 1. What is the Percent Zinc of Zinc Iodide as determined by a Titrimetric analysis? Using the Zinc Iodide (elemental synthesis), we found the percent zinc to be 21.94%. Using the Zinc Iodide (standard synthesis), we found the percent zinc to be 21.87%. This averages to 21.9% zinc. 2. What is the Percent Zinc of the Unknown Zinc Salt as determined by a Titrimetric analysis? The percent zinc of the unknown zinc salt was determined to be 43.68% IV. Procedure 1. Begin to prepare an EDTA solution.  Weigh out 3.62-3.64 g of NaH2EDTA and record exact mass. Add the weighed amount to a 250 ml volumetric funnel carefully using a funnel  Wash the funnel with water to ensure all of the solid is delivered to the flask  Add 100-200 ml of water and mix. Enough water should be added so that the flask is full to the 250 ml mark  Tightly wrap the top of the flask with a Parafilm when finished 2. Set up the titration apparatus 3. Fill a dry 50 ml buret with EDTA solution using a small…show more content…