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CHM 114 Exp8 - Determining Ksp Purpose of Experiment The...

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Determining K sp
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Purpose of Experiment The purpose of this experiment was to learn how to determine K sp . This is the solubility product constant of a compound. This simply describes the degree to which a solid will dissolve in water. Saturated solutions and their precipitates will be used to produce and dissolve these solids while determining K sp . Experimental Procedure Part 1: Equipment Preparation 1. Label 5 test tubes accordingly: HCl, KIO 3 , Sr(NO 3 ) 2 , Na 2 S 2 O 3 , Starch. 2. Add 15 mls of each solution to the respective test tube. 3. Record concentration of the Na 2 S 2 O 3 . 4. Label 4 Beral pipets to match the previously labeled test tubes. 5. Label 1 150 mL beaker, H2O and fill with approximately 50ml of distilled water. 6. Label 2 smaller Beral pipets: Reaction pipet and Titration pipet. 7. Label 1 150 mL beaker Pipets and place the pipets in the beaker, bulbs down. Part 2a: Calibrating the reaction pipet 1. Fill a 10 mL graduated cylinder with exactly 2 mL of distilled water. 2. Draw water into Reaction pipet but position the pipet horizontally over the graduated cylinder. 3. With the tip over the top of the graduated cylinder, press on the bulb to dispense the water drop wise. 4. Count the drops as they are released into the graduated cylinder until you reach precisely 3 mL. 5. Record the number of drops in your laboratory notebook. 6. Repeat the procedure until there is precisely 4 mL and then 5 mL in the cylinder. 7. Discard the water into the waste beaker when finished. Part 2b: Calibrating the titration pipet 1. Fill a 10 mL graduated cylinder with Na 2 S 2 O 3 exactly to the 2 mL mark.
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