Acids, Bases and pH
Materials
· Solutions A-E
· Apple Juice
· Mountain Dew
· Soap solution
· Bleach Solution
· 5 beakers
· pH hydrion paper
· Silver Nitrate
1m HCl (hydrogen Chloride)
· Sodium Chloride
· Lead Nitrate
· Sodium Iodide
· Bromothymol Blue
· Phenolphthalein
· pH meter
Purpose:
The overall purpose of this lab was to distinguish the pH levels of the different types of liquids given using Bromothymol Blue, pH hydrion paper and a pH meter. By doing these tests we will be able to differentiate between an acid and a base.
Results:
Solution PHydrion Paper Color after adding BTB Color after adding Phenolphthalein pH Readimg
A 5 Yellow Cloudy white 5.04
B 9 Blue Pink 9.17
C 6 Yellow Cloudy white 4.55
D 3 Yellow Cloudy white 2.49
E 8 Blue-green Pink 7.85
Common Solutions pH Meter Readings
Apple Juice 3.68
Bleach 11.03
Mountain Dew 2.86
Soap 9.55
Conclusion:
The pH is the measure of hydrogen ions in a solution. The amount of hydrogen ions in a solution determines if the solution is an acid or a base. There is a scale that measures whether the solution is an acid or a base, which is called a pH scale. One to six is acidic, seven is neutral and eight to fourteen is basic. Bromothymol blue (BTB) and Phenolphthalein also indicates whether a solution is acidic or basic. Bromothymol blue turns the solution yellow when acidic, blue when basic and blue green when neutral. Phenolphthalein turns solutions cloudy white when acidic and pink when basic. We figured out that the pH meter is the best tool to use when measuring pH because it gives you the accurate reading on how acid or basic a solution is.