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Additional resources for Forensics Laboratory Manual: Chemistry Matter and Change,Student Edition
Name Date LAB C 3 Class FORENSICS LABORATORY MANUAL Identifying Sacrificial Metals Problem Objectives Materials Which metals will react with corroding agents to prolong the life of an iron structure? • Compare and contrast the effects of water on zinc and iron. • Determine which metals will protect iron from corrosion. agar 1M potassium ferrocyanide (K4[Fe(CN)6]) phenolphthalein solution iron nails magnesium ribbon copper wire galvanized nails 100-mL graduated cylinder 400-mL beaker petri dishes stirring hot plate magnetic stirrer Celsius thermometer distilled water Safety Precautions • Always wear safety goggles and a lab apron.
Enter 1 as the number of probes. On the SELECT PROBES menu, choose pH. Enter 1 as the channel number. Select USE STORED from the CALIBRATION MENU. Part B: Collecting Data 1. Label five test tubes A, B, C, U, and D, respec- tively. Place the test tubes in the test-tube rack. 2. Measure 20 mL of solution A and pour it into the test tube labeled A. Rinse the graduated cylinder with distilled water and repeat this step for solutions B and C, the unknown solution (U), and distilled water (D). 20 Chemistry: Matter and Change • Chapter 19 Data and Observations Data Table 1 pH Data Test tube pH A B C U D Forensics Laboratory Manual Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
Enter 1 as cable the channel number. Then select USE STORED from the CALIBRATION menu and select H 1-2000 MICS from the CONDUCTIVITY menu. Make sure the switch on the box is set to the same value. 5. From the MAIN MENU, select COLLECT DATA. On the DATA COLLECTION menu, select TRIGGER PROMPT. Allow the unit to warm up and then press ENTER. Part B: Collecting Data 1. Label five test tubes A, B, C, U, and D, respectively. Place the test tubes in the test-tube rack. 2. Measure 20 mL of solution A and pour it into the test tube labeled A.