Hydrogen Bonding Lab
Purpose:
The purpose of the lab was to investigate and demonstrate hydrogen bonding and London dispersion bonding in water and rubbing alcohol.
Hypothesis:
I believe water will have the greater surface tension because rubbing alcohol’s density is lower than water’s.
Materials: * Water * Isopropyl alcohol (rubbing alcohol) * Pennies * Paper clips * Flasks * Cups or jars * Wax paper * Eyedropper
Procedures:
Part 1: Surface tension and vortex: * Fill one flask half way full with rubbing alcohol. * Fill another flask half way full with water.
Caution: Plug the flask to prevent vapors from polluting the room. * Carefully swirl each flask to create the vortex. * Stop swirling each flask and time …show more content…
Part 2: Surface tension and droplet shape: * Use an eyedropper to transfer one drop of water and rubbing alcohol onto the wax paper. * The liquid with higher tension will not spread out far while lower tension will spread out. * Identify with liquid has the higher tension and record the data.
Part 3: Surface tension and impenetrability: * Fill a cup or jar with water and another with rubbing alcohol. * Gradually lower down a paper clip into both liquids using a cradle motion with another paper clip. * Identify with liquid can withstand the weight of the paper clip and record the data.
Part 5: Comparing surface tension of liquids: * Fill a jar to the brim with rubbing alcohol and another with water. * Examine the rim of each jar. * Carefully add pennies, one by one, into the jar. * Stop once the liquid overflows. Record the data. * Clean and wash your hands before leaving your lab station.
Data:
| Water | Rubbing Alcohol | Part 1 | 5 seconds | 2.5 seconds | Part 2 | Keeps shape. Greater surface tension. | Spreads out. Lower surface tension. | Part 3 | Float. Greater surface tension. | Sink. Lower surface tension. | Part 5 | |
The purpose of the lab was to investigate and demonstrate hydrogen bonding and London dispersion bonding in water and rubbing alcohol.
Hypothesis:
I believe water will have the greater surface tension because rubbing alcohol’s density is lower than water’s.
Materials: * Water * Isopropyl alcohol (rubbing alcohol) * Pennies * Paper clips * Flasks * Cups or jars * Wax paper * Eyedropper
Procedures:
Part 1: Surface tension and vortex: * Fill one flask half way full with rubbing alcohol. * Fill another flask half way full with water.
Caution: Plug the flask to prevent vapors from polluting the room. * Carefully swirl each flask to create the vortex. * Stop swirling each flask and time …show more content…
Part 2: Surface tension and droplet shape: * Use an eyedropper to transfer one drop of water and rubbing alcohol onto the wax paper. * The liquid with higher tension will not spread out far while lower tension will spread out. * Identify with liquid has the higher tension and record the data.
Part 3: Surface tension and impenetrability: * Fill a cup or jar with water and another with rubbing alcohol. * Gradually lower down a paper clip into both liquids using a cradle motion with another paper clip. * Identify with liquid can withstand the weight of the paper clip and record the data.
Part 5: Comparing surface tension of liquids: * Fill a jar to the brim with rubbing alcohol and another with water. * Examine the rim of each jar. * Carefully add pennies, one by one, into the jar. * Stop once the liquid overflows. Record the data. * Clean and wash your hands before leaving your lab station.
Data:
| Water | Rubbing Alcohol | Part 1 | 5 seconds | 2.5 seconds | Part 2 | Keeps shape. Greater surface tension. | Spreads out. Lower surface tension. | Part 3 | Float. Greater surface tension. | Sink. Lower surface tension. | Part 5 | |