Acids_and_Bases

Acids_and_Bases - ScienceDEMO Acids and Bases NaHCO3...

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Acids and Bases Page 1 of 3 ScienceDEMO Acids and Bases NaHCO 3 (sodium bicarbonate, baking soda) and vinegar (dilute acetic acid) will be used to shoot a cork out of a bottle to show that some acid-base reactions generate gases like CO 2 . All students in the class will participate in a voice-activated chemical reaction. Students will remove a stopper and speak into a flask containing base and an indicator that will change color once enough CO 2 is introduced from the students’ breath. Further color changes from basic to acidic conditions is illustrated using natural and household liquids and a universal indicator prepared from red cabbage juice. Reaction of metal and acid will be shown with Mg and Sprite. Materials You Provide: Empty 1L plastic soda bottle with label removed Colorless vinegar Red cabbage juice (make the day before) 1 lemon, 1 soap bar, Sprite, vinegar, drain cleander 7 stirring rods (e.g., plastic straws) Flat Sprite or 7-up Water Materials LSU Provides *schedule your pick-up time with the Chem Lab in advance. Plastic powder funnel (YOU MUST RETURN!) Cork with streamers attached by a thumbtack (YOU MUST RETURN!) Container of de-ionized water Sodium bicarbonate (RETURN ANY UNUSED AMOUNTS) 250 mL Erlenmeyer flask (YOU MUST RETURN!) Dropper bottle with colorless phenolphtalein indicator (YOU MUST RETURN!) Small amount of 1 M NaOH solution (YOU MUST RETURN!) Disposable plastic droppers (YOU MUST RETURN!) Ethanol (YOU MUST RETURN!) Seven 200 mL beakers (YOU MUST RETURN!) Sodium bicarbonate (RETURN ANY UNUSED AMOUNTS) 10 mL disposable plastic syringe (YOU MUST RETURN!) Bottle to put flat colorless soda into (YOU MUST RETURN!) Magnesium chips (YOU MUST RETURN!) Objectives/Chemistry **SAFETY NOTE: Students should wear safety glasses. Most of the chemicals used are dilute (except for the 1 M NaOH) and not particularly dangerous. Needless to say, none should be consumed (except for the Sprite). If students get any of the chemicals used on their clothes or skin it can be simply washed off in the bathroom. The sodium bicarbonate is not dangerous (but should not be consumed) and can be used to neutralize any vinegar or NaOH solution that gets spilled. All chemicals can be safely washed down a bathroom sink. First explain to the students that scientists write down what they observe and that they must do the same when you perform
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This note was uploaded on 10/05/2011 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Acids_and_Bases - ScienceDEMO Acids and Bases NaHCO3...

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