Transcript pH of Common Substances and Compounds Denise Arandia

pH of Common Substances and
Compounds
Denise Arandia
Michelle Armario
Raisa Crisologo
Joshua Fernandez
Ryan Santos
Introduction
What is pH?
A measurement used in order to indicate whether a
substance/mixture is acidic or basic.
The negative logarithm of the hydrogen ion
concentration.
Procedure
PART 1:
Number the test tubes from 1-13. Add 5 mL of each
solution to each test tube.
Test Tube 1: Most concentrated acid
Test Tube 7: 0.01M NaCl solution
Test Tube 8: Least concentrated base.
Add a few drops of indicator solution and observe the
results.
Procedure
PART 2:
Determine the pH range of the various substances
and mixtures suggested by the instructor.
Feminine Wash
Tears
Body Wash
Sugar
Sprite
Alcohol
Results
[H3O+] (M)
1 x 10-1
1 x 10-2
1 x 10-3
1 x 10-4
1 x 10-5
1 x 10-6
[OH-] (M)
1 x 10-13
1 x 10-12
1 x 10-11
1 x 10-10
1 x 10-9
1 x 10-8
pH
1
2
3
4
5
6
1 x 10-7
1 x 10-8
1 x 10-9
1 x 10-10
1 x 10-7
1 x 10-6
1 x 10-5
1 x 10-4
7
8
9
10
1 x 10-11
1 x 10-12
1 x 10-13
1 x 10-3
1 x 10-2
1 x 10-1
11
12
13
Color
Dark red
Red
Red orange
Orange
Yellow orange
Lighter yellow
orange
Dark yellow
Yellow
Yellow green
Darker yellow
green
Green
Blue
Dark blue/ purple
Results
Substance/Mixture
Observations
pH Range
Feminine Wash
Bubbly, yellow
orange
5
Tears
Dark green
11-12
Body Wash
Bubbly, yellow
orange
5
Sugar
Yellow orange
7-8
Sprite
Bubbly, light red
2-3
Acetone
Red
1-2
Conclusion
Indicator
Dye that changes color
Acid-base
Weak organic acids (different colors from their conjugate
bases)
Range of hydrogen ions
Phenolphtalein
pH measured with pH meter (numerical value)
Applications
Aquariums
Some fish can only live in
a certain range of pH leve
of water.
An ideal pH for goldfish to
live safely is 6.6-8.4
Commercial
Products
Liquid soap usually has a
pH level of 6-10. Having a
high pH level makes the
soap more anti-bacterial.
Shampoo has a slightly
acidic pH level since a
more basic environment
weakens the hair.
Plants
The ideal pH living
conditions for common
fruits and vegetables is
around 4.5-7.5. Using
limestone could increase
the pH level of soil while
using aluminum sulfate
can lower pH levels.
Marine Life
Corals are very sensitive
to the pH of the seawater.
They only survive in 8.38.5 pH. If the pH of the
seawater drops or
increases, the corals
would eventually die.