Lab 1 Chm Osc Rxn Prelab Questions Sp2020

A Chemical Oscillation Reaction, Chapter 1 CHM 11600, Spring 2020 (You may also need to refer to Appendices B and C to answer these questions.) Prelab Questions As part of your individual preparation for lab, read the experiment and answer the following questions. (Your answers will not be collected or graded.) You will take a quiz on Blackboard related to these practice questions. The quiz is due at YOUR lab start time. 1. a) What mass (in g) of malonic acid is needed to prepare 50.0 mL of 0.15 M malonic acid? b) What mass (in g) of MnSO 4 •H 2 O is needed to prepare 50.0 mL of 3020 ppm MnSO 4 ? 2. a) What mass (in g) of KIO 3 is needed to prepare 50.0 mL of 0.20 M KIO 3 ? b) What volume (in mL) of 0.15 m H 2 SO 4 is needed to prepare 50.0 mL of 0.080 M H 2 SO 4 ? 3. What volume (in mL) of 30% (by mass) H 2 O 2 is needed to prepare 25.0 mL of 3.6 M H 2 O 2 ? 4. What assumption do you need to make about Solution 2 for your calculations? (Refer to the lab manual.) 5. What procedural step will you take to be sure all of the KIO 3 dissolves when making Solution 1? (Refer to the lab manual.) 6. What needs to be present in the 100-mL beaker before you add Solutions 1-3 to the beaker and start the oscillation reaction? 7. Review the MSDS for 30% H 2 O 2 , which can be found at the link below. Summarize the safety hazards associated with 30% H 2 O 2 in your own words . http://www.flinnsci.com/Documents/SDS/H/HydrogenPeroxide.pdf 8. Explain, in your own words , how the uncertainty (tolerance) of a piece of glassware is used to determine the proper number of significant figures to record for a measurement. 9. When using a milligram balance located on the side bench in the main laboratory room, to how many decimals places should a mass be recorded? 10. To how many decimal places should you record a volume delivered from a buret used in one of our laboratories?