- Dilute solutions of HCl and NaOH in different test tubes according to the table below, add 5 mL of H2O2 to each test tube, swirl to mix
- Set up a water displacing station: fill a water trough and graduated cylinder with water (to the top), invert the graduated cylinder into the water trough carefully (do not let air in). Place a beaker underneath the water trough to collect displaced water.
- Insert a rubber tube into the graduated cylinder that is connected to a rubber stopper (will be used to cover Erlenmeyer flask)
- In an Erlenmeyer flask, add 5 pieces of filter paper (soaked in liver juice) to the bottom of the flask
- Add the first dilution into the flask, shake and cover the flask immediately, use a timer to record time needed for the reaction.
- Stop timer and record results when oxygen stops displacing water and when water stops overflowing from the water trough
- Repeat steps 2-6 for other dilutions
HCL | 3ml | 1ml | |
Water | 0ml | 2ml | 4ml |
time | 39’ | 1:07’ | 1:45’ |
Amount water displaced | 0 ml | 0ml | 5ml |
NaOH | 1ml | 2ml | 3ml | 1ml *2nd trail | |
Water | 4ml | 3ml | 2ml | 4ml | |
time | 2:10’ | 3:00’ | 2:40’ | 2:21’ | |
Amount of displaced | gas | 153ml | 15ml | 5ml | 167ml |
water | 115ml | 11ml | 2ml | 220ml |
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