5 m sodium hydroxide naoh 25 g commercial vinegar

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Unformatted text preview: agents ~50 mL 0.5 M sodium hydroxide (NaOH) ~25 g commercial vinegar (HC2H3O2) ~1 mL phenolphthalein solution www.webassig n.net/ebooks/wsug encheml1/lab_10/manual.html 3/5 4/15/13 Lab 10 - Titr ations deionized water Safety NaOH is corrosive. It can attack the skin and cause permanent damage to the eyes. If NaOH solution splashes into your eyes, use the eyewash immediately. Hold your eyes open and flush with water. If contact with skin or clothing occurs, flush the affected area with water. Have your lab partner notify your instructor about the spill. Waste Disposal Dispose of all solutions as directed by your instructor. Prior to Class Please read the following sections of the Introductory Material: Analytical Balance Volumetric Glassware Measurements Please review the following videos: Cleaning and Conditioning a Buret Titration Cleaning a Buret Lab Procedure Please print the worksheet for this lab. You will need this sheet to record your data. 1 Obtain a clean, dry 10.0 mL graduated cylinder. 2 Using a clean, dry 30 mL beaker, obtain about 25 mL of vinegar. 3 Condition the graduated cylinder with vinegar solution before using it. This is done by adding a little vinegar solution to the graduated cylinder, swirling so that all of the sides are coated with vinegar and then discarding the remaining vinegar. Repeat this procedure 1 - 2 more times to ensure that the graduated cylinder is conditioned. 4 Obtain about 50 mL of 0.5 M NaOH solution in a clean, dry 100 mL beaker. Record the exact concentration of NaOH in Table A1. www.webassig n.net/ebooks/wsug encheml1/lab_10/manual.html 4/5 4/15/13 Lab 10 - Titr ations 5 Condition the 25.0 mL buret with NaOH solution as directed by your instructor, and according to the description in "Volumetric Glassware" in Lab Equipment. 6 Fill the buret with NaOH and carefully clamp it to the ring stand. 7 Record the initial reading on the buret, to the nearest 0.01 mL in Table A1. Reading a buret to this accuracy is tricky. Remember, the last significant figure is expected to be...
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This document was uploaded on 01/22/2014.

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