Acids and bases: 3/18/2021

 This week my classmates and I were able to further our understanding on pH levels and how they change from substance to substance. In addition to this lab we were able to participate in a virtual experiment that allowed us to observe the pH balance of different liquids while changing the conditions.

Materials:

 4 tarnished pennies

Vinegar, water, baking soda, lemon juice, ammonia

5 small cups

Stirring rods

pH strips

Lab: The objective of this lab was to monitor the pH level of the liquids, and it's relationship to the pennies. To begin my partner and I poured vinegar, water, baking soda, lemon juice, and ammonia into 5 small cups then placed the pennies inside. Next we used the pH strips to test the levels while the pennies where in the cups. The chart below shows the levels recorded with the pennies in the cups (black) and the levels once they were removed (red) along with the affect on the pennies. Once the levels were recorded we removed the pennies and took the pH once again. The photos below are from the lab and our results. 

 

	Lemon juice	Baking soda	Vinegar	Ammonia	Water
pH	1.5 1.5	7 7.5	1.5  1.5	11  11	7  7
Penny shine	Shiny	No change	Shiny	No change	No change