understanding pH

Question 1

pH is an essential component of

Answer 1

environmental science, chemistry, biology, medicine

Question 2

pH stands for

Answer 2

potential of hydrogen

Question 3

what is the pH scale?

Answer 3

measure of how acidic or basic a solution is (0-14)

Question 4

what pH level is neutral? example

Answer 4

7. pure water

Question 5

lower concentrations of hydrogen ions=

Answer 5

higher pH level, basic/alkaline

Question 6

higher concentrations of hydrogen ions=

Answer 6

lower pH levels, acidic

Question 7

how is pH calculated

Answer 7

taking the negative log of H+ ion concentration

Question 8

which words mean the same thing?

Answer 8

basic and alkaline

Question 9

the pH scale is

Answer 9

logarithmic, so a whole number means a tenfold change

Question 10

pH of 3 is ___x more acidic than ph of 4

Answer 10

10

Question 11

acidic solutions + ex

Answer 11

pH less than 7; lemon juice and vinegar

Question 12

basic solutions + ex

Answer 12

pH greater than 7; baking soda and bleach

Question 13

pH is important due to

Answer 13

biological processes, env. impact, industrial applications

Question 14

1. biological processes

Answer 14

affects enzyme activity and metabolic processes

Question 15

1. ## biological processes-

Answer 15

• human blood: 7.35-7.45 pH normal
• plant growth: soil pH affects nutrient availability to plants. thrive I slightly acidic to neutral pH (6-7)

Question 16

2. environmental impact

Answer 16

impacts water quality and ecosystem health

Question 17

2. ## Environmental impact-

Answer 17

Acid rain: less than 5.6 is acidic. Harms aquatic life by altering pH of lakes
Aquatic systems: organisms have specific pH ranges for survival. Trout: 6.5-8

Question 18

3. Industrial applications

Answer 18

Monitored and controlled to ensure product quality and safety

Question 19

-

Answer 19

Good and beverage: pH regulated for desired flavors and preservation.
Pharmaceutical: efficiency and stability of medicine depends on pH levels

Question 20

PH indicators

Answer 20

Substance that changes color based on acidic or basic

• limis paper
  Phenoliojhelin

Question 21

pH meters

Answer 21

Electronic devise that measures precise pH. It’s a probe used in labs and industries

Question 22

how do you calculate pH

Answer 22

-log[H+]

where h+ is the concentration of hydrogen ions in moles/liters

as h+ increases, pH decreases

Question 23

acids (4 b)

Answer 23

• release hydrogen ions
• sour taste
• reacts with metal
• cintric and hydrochloric acid

Question 24

bases (4b)

Answer 24

• accepts H- ions or release OH - ions
• bitter taste
• slippery
• sodium hydroxide, ammonia

Question 25

applications of pH knowledge

Answer 25

1. gardening
2. swimming pools
3. health and nutrition

Question 26

1. gardening

Answer 26

gardeners need to know the pH of soil for healthy growth. soil testing kits–> lime to increase pH and sulfur to decrease

Question 27

2. swimming pools

Answer 27

7.2-7.8 pH for comfort and reduce damage to equipmment

Question 28

3. health and nutrition

Answer 28

pH of foods affect digestion and nutrient absorption
–> too acidic: discomfort
–> too alkaline: interferes with stomach acidity