Day 1: Chemistry Bubbles Protocol Lab Partners: Ricky M. Rodriguez and Talia Towe January 12, 2016
Purpose: To practice testing pH levels
Procedure:
Gather Materials:
100 mL of saltwater
At least a 500 mL beaker
1 transfer pipette
1 mL of universal indicator
2 pH strips
1 white sheet of paper
Universal Indicator Color Chart
Para film or cling wrap (enough to fit the top of the beaker)
2 straws
Well plate
Add all of the saltwater to the beaker.
Using the transfer pipette, add all of the universal indicator and mix.
Place beaker on the white sheet of paper.
Record the initial color using the Universal Indicator Color Chart.
Stretch para film or cling wrap to completely cover the top of the beaker.
Insert the straw by poking a hole through the para film or cling wrap.
Use the straw to expand the hole slightly. (This is important so you or your partner don't get the liquid in you mouth)
One partner will be recording and timing, the other will be blowing bubbles.
If you are recording and timing, you are recording the pH of the liquid in 30 second intervals.
If you are blowing bubbles, keep the straw in that hole that you created. Then you will be blowing bubbles in 30 second intervals. (after each interval, check pH level)
Do this until your blower has blown bubbles for a total of 2 minutes.
Make sure to check the temperature before the trial and after the 4th 30 second interval.
Graph data. (time in the x-axis and pH in the y-axis)
Observations: The original experiment: pH: 7.5 pH: 7 pH: 6.5 pH: 6.5 pH: 6.5
Experimental: My partners and I changed to distilled water pH: 6 pH: 5 pH: 5 pH: 5 pH: 5 pH: 5
Conclusion: I found it interesting how there were different pH levels for saltwater vs. distilled.
Extra notes: Using a well plate, we tested the pH levels for: