2014 Experiment 4.pdf - 151-Experiment 4-1 EXPERIMENT 4...

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151-Experiment 4-1 EXPERIMENT 4 REDOX REACTION OR NOT? Guidelines for grading Pre-lab Assignment #4 The Procedure outline of this pre-lab assignment is 4 pts. 2 pts were deducted for each mistake unless the question is worth less than 2 pts. For Questions 5 and 7, work must be shown in order to receive credit. Each part of Question 7 is worth 2 pts (but no double jeopardy ). Answer key for Pre-lab Assignment #4 2.(1 pt.) Which step of this experiment calls for using a yellow magnetic bar to do the stirring? Enter the Step number in the box provided. 3. (2 pt.) In the box below, enter the name and the molecular formula of the chemical used as a surfactant in this experiment. 4.(5 pts.) When aqueous ammonia is added to a ferric chloride solution, what is the product of the reaction? Enter the molecular formula of the product in the box on the right and enter the balanced net ionic equation in the box below to illustrate this reaction. 5. (4 pts.) The ferrous chloride solution and ferric chloride solution used in Part A of this experiment must be prepared in a strong acid to prevent the Fe 2+ and Fe 3+ ions from reacting with water to become oxides or hydroxides. According to Step 2, how much HCl has been added to the Erlenmeyer flask?
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