E4 Hypochlorite In Bleach - (NH 4 ) 2 Cr 2 O 7 in this...

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EXPERIMENT 4 Sodium Hypochlorite in Bleach Write the answers to these pre-laboratory questions in your lab notebook. Answers to these questions are due at the beginning of your lab section during the week of September 26– September 30. While we will not cover the concept of molarity in lecture until later in the semester, Sections 12-1 and 12-2 of the textbook (pages 393-399) discuss molarity and include some equations and examples that may be useful for answering some of the prelab questions and for carrying out the necessary calculations in this experiment. Pre-laboratory Questions: 1. Write the experiment title and purpose in your lab notebook. 2. (a) Using a volumetric flask, a student makes 500.0 ml of (NH 4 ) 2 Cr 2 O 7 solution by dissolving 68.86 grams of (NH 4 ) 2 Cr 2 O 7 in distilled water. Calculate the molarity of
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Unformatted text preview: (NH 4 ) 2 Cr 2 O 7 in this solution. (b) The student then pipets 50.00 ml of the (NH 4 ) 2 Cr 2 O 7 solution made above in part (a) into a 250.0 ml volumetric flask and adds distilled water to the mark. Calculate the molarity of (NH 4 ) 2 Cr 2 O 7 in this diluted solution. 3. Explain the purpose of starch in this experiment. 4. According to the lab manual, there are two things that you should not do when using a pipet because they could result in a serious injury. (a) What are the two things you should not do when using a pipet? (b) Why could doing either of these things cause an injury? (c) What is the proper technique for using a pipet correctly and safely? 5. Look up the MSDS for sodium hypochlorite. What should you do if some bleach solution spills on your hands?...
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