Lab 7 Danielle Menningmann - CHEM2800L.docx - Lab 7 Report...

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Lab 7 Report Sheet Danielle Menningmann Prelab Questions 1) a. 1000 mL× 100 μg mL = 100 mg = 0.100 g ASA 2 × 10 = 20 mL HCl b. Weigh 0.100 grams of ASA and add to 1000mL volumetric flask. Wet the solid with methanol to increase solubility. Fill up halfway with water and add 20mL of HCl. Then fill to the line with water. Invert the flask several times. 2) C 1 (ppm) stock V 1 (mL) of stock C 2 (ppm) V T (mL) 100 0 0 (blank) 10 100 .4 4 10 100 .6 6 10 100 .8 8 10 100 1 10 10 100 1.5 15 10 100 2 20 10 10mL-0.4mL=9.6mL water and 0.4 mL stock for 2 nd row 3)Using a mortar, grind the tablet. Place this in a 1 liter volumetric flask. Add 307.7 microliters of this solution to 9.69mL of water. Part4. Unknown: 308 microliter of tablet sln Part 5. Use 1 mL stock sln to 9mL water for known sln(10ppm) Part 7. Unknown and 10ppm spike: 308 tablet sln, 1 mL ASA Dilution factor: y i y f = x i x i + 10.00 ppm .308mL 308microliters
Results and Discussion 1) Table 1. Raw Data Concentrati on Absorbanc e- Ethan Wagner Onyi Okere Stella Vera Danielle Menningma nn Shaharaz ad Stephens Blank 0.0011 - 0.0134 - 0.0193 -0.0003 0.0002 4 ppm 0.0271 0.0264 0.0150 0.0280 0.0282 6 ppm 0.0351 0.0287 0.0219 0.0383 0.0414 8 ppm 0.0483 0.0398 0.0355 0.0601 0.0497 10 ppm 0.0622 0.0506 0.0505 0.0645 0.0634 15 ppm 0.1246 0.0797 0.0813 0.0956 0.1039 20 ppm 0.1279 0.1161 0.1084 0.1384 0.1281 100 ppm 0.6222 0.6344 0.5900 0.6308 0.6169

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