pH of Common Substances and Compounds

pH of Common Substances and Compounds

Denise ArandiaMichelle ArmarioRaisa Crisologo

Joshua FernandezRyan Santos

Denise ArandiaMichelle ArmarioRaisa Crisologo

Joshua FernandezRyan 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 WashTearsBody WashSugarSpriteAlcohol

Results

[H3O+] (M) [OH-] (M) pH Color1 x 10-1 1 x 10-13 1 Dark red1 x 10-2 1 x 10-12 2 Red1 x 10-3 1 x 10-11 3 Red orange1 x 10-4 1 x 10-10 4 Orange1 x 10-5 1 x 10-9 5 Yellow orange1 x 10-6 1 x 10-8 6 Lighter yellow

orange1 x 10-7 1 x 10-7 7 Dark yellow1 x 10-8 1 x 10-6 8 Yellow1 x 10-9 1 x 10-5 9 Yellow green1 x 10-10 1 x 10-4 10 Darker yellow

green1 x 10-11 1 x 10-3 11 Green1 x 10-12 1 x 10-2 12 Blue1 x 10-13 1 x 10-1 13 Dark blue/

purple

ResultsSubstance/Mixture

Observations pH Range

Feminine WashBubbly, yellow

orange5

Tears Dark green 11-12

Body WashBubbly, yellow

orange5

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)

ApplicationsApplications

AquariumsAquariumsSome 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

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

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.

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.

PlantsPlantsThe 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.

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 LifeMarine LifeCorals are very

sensitive to the pH of the seawater. They

only survive in 8.3-8.5 pH. If the pH of the seawater drops or

increases, the corals would eventually die.

Corals are very sensitive to the pH of

the seawater. They only survive in 8.3-8.5

pH. If the pH of the seawater drops or

increases, the corals would eventually die.