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NTHS Chemistry Labs Quarter 3 LAB PRACTICAL Unknown Hydrate Pre

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NTHS Chemistry Labs Quarter 3 LAB PRACTICAL Unknown Hydrate Pre NTHS Chemistry Labs Quarter 3 LAB PRACTICAL Unknown Hydrate Pre-Lab & Practical 1 Name: ________________________________________________________ Date: ___________________ Chemistry Lab Mr. Zamojski Q3 – Unknown Hydrate PRE-LAB ASSIGNMENT Required Safety Data Sheets (SDS): 1) Magnesium Sulfate, Heptahydrate 2) Magnesium Sulfate ➢ These 2 safety data sheets (SDS) are attached at the end of this pre-lab assignment. You can also refer to the Flinn Scientific SDS database (www.flinnsci.com/sds) Required Pre-Lab Video: NONE QUESTIONS: Refer to the information from the SDS to answer the questions below. Refer to the SDS for Magnesium Sulfate, Heptahydrate. 1) Refer to Section 2 – Hazards Identification. a) Are there any hazards associated with this chemical? ________________________________ 2) Refer to Section 3 – Composition, Information on Ingredients a) What is the formula of this chemical? ____________________________________________ b) What is a synonym for this chemical? ____________________________________________ 3) Refer to Section 9 – Physical and Chemical Properties a) What color is this chemical? _______________ 4) Refer to Section 13 – Disposal Considerations a) What is the Flinn Suggested Disposal Method for this substance? #___________ Refer to the SDS for Magnesium Sulfate. 5) Refer to Section 2 – Hazards Identification. a) This chemical may be harmful if ____________________ or in contact with _______________. 6) Refer to Section 3 – Composition, Information on Ingredients a) What is the formula of this chemical? ____________________________________________ 7) Refer to Section 9 – Physical and Chemical Properties a) What color is this chemical? _______________ 2 8) Refer to Section 13 – Disposal Considerations a) What is the Flinn Suggested Disposal Method for this substance? #___________ 9) What will you wear throughout this laboratory activity to protect yourself from these chemical hazards? ______________________________________ AND _______________________________________ 3 Name: _____________________________________________________ Date: _________________ Partner(s): ____________________________________ Chemistry Lab Mr. Zamojski Q3 – Unknown Hydrate LAB PRACTICAL Background: In the previous lab you heated copper (II) sulfate, pentahydrate (CuSO4•5H2O) to obtain anhydrous copper (II) sulfate (CuSO4). The difference in mass between the two samples was the mass of water that was removed from the hydrated compound. You then used this mass to calculate the percent water in your sample. Purpose: The purpose of this activity is to practice problem solving skills and to use measurements and lab techniques to find the percent water in a specific hydrate. Goal: Your grade for this lab will be determined by how close the percent water you measure or calculate is to the accepted percent water for your hydrate. Your Grade = (100% – Your Percent Error) × 10 points Complete as many trials as you need to determine the percent water in a specific hydrate. Your grade will come from your BEST trial. Materials: goggles Bunsen burner tongs disposable gloves ring stand scoopula iron ring crucible & cover Epsom salts (MgSO4•7H2O) lighter pipeclay triangle digital scale wire mesh Procedure: 1) Before you can attempt the practical, you must write the procedure you will follow for your first trial. a. In your procedure any time you are executing a process or taking a measurement include the equipment or tool you are using. 2) Once the instructor approves the procedure, you may proceed. 3) Record any measurements you make in the DATA section on PROCEDURE page. 4) Once you have your percent water, bring that value to the instructor. Your instructor will calculate your percent error and inform you of your grade. Record your percent error and your grade 5) If you are satisfied with your grade, you may clean up your lab station. If you are not satisfied with your grade, you may complete additional trials. a. Notify your instructor of any changes you plan to make to your procedure for additional trials. 4 Clean Up: *** Do NOT touch any hot equipment until it has cooled sufficiently.*** 1) All materials can be thrown out or poured down the drain. 2) Wash and leave to dry any used equipment. 3) Return any equipment to its appropriate location in the lab. 4) Wash your hands with soap and water. Then dry them with a paper towel. PROCEDURE for First Trial: DATA: Percent Water in Hydrate: ___________________________ Percent Error = _____________________________ Grade = __________________ 5 Name: _____________________________________________________ Chemistry Lab - Mr. Zamojski Q3 – Unknown Hydrate Additional Trials DATA: Percent Water in Hydrate: ___________________________ Percent Error = _____________________________ Grade = __________________ ……………………………………………………………………………………. DATA: Percent Water in Hydrate: ___________________________ Percent Error = _____________________________ Grade = __________________ 6 .
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