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Understanding Chemistry. Environmental Science 2010. PERIODIC TABLE. Living Matter made up of:. C = Carbon H = Hydrogen N = Nitrogen O = Oxygen P = Phosphorous S = Sulfur. Importance of pH=Homeostasis.

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understanding chemistry

Understanding Chemistry

Environmental Science 2010

living matter made up of
Living Matter made up of:
  • C = Carbon
  • H = Hydrogen
  • N = Nitrogen
  • O = Oxygen
  • P = Phosphorous
  • S = Sulfur
importance of ph homeostasis
Importance of pH=Homeostasis

1. All living organisms require specific pH ranges in order for their cells to function properly.

2. pH – potential Hydrogen (H+) in water or whatever liquid is being measured.

importance of ph
Importance of pH

3. In more everyday terms, pH is a unit of measure for determining if a liquid is acidic or basic (alkaline).

4. pH is measured on a scale of 0.0 to 14.0.

a. Numbers < 7.0 = acidic

b. Numbers > 7.0 = basic

c. A pH of 7.0 indicates a neutral liquid

ph acids and bases
pH: Acids and Bases
  • Acid—any substance that releases H+ (hydrogen ions) when mixed with water
  • Base—any substance that releases OH- (hydroxide ions) when mixed with water
acids and bases
Acids and Bases
  • The stronger an acid is the lower its pH number.
  • The stronger a base is the higher its pH number.
acids h ion
Acids = H+ ion
  • Examples of acids
  • Vinegar and battery acid are examples of acids. Acids have the following properties:
  • Acids taste sour.
  • They react strongly with metals.
  • Strong acids are dangerous and can burn your skin.
bases oh ion
Bases = OH- ion
  • Baking soda and bleach are examples of basic substances, or bases. Bases have the following properties:
  • Bases taste bitter.
  • They feel slippery.
  • Strong bases can burn your skin.
more on ph
More on pH
  • The pH scale is logarithmic. Means is that a change of one pH unit reflects a tenfold change in H+ concen or acidity.
  • Some examples can help illustrate how this works:

a. Liquid with a pH of 6.0 = 10X more acidic than

pure water (pH=7.0).

b. Liquid with a pH of 5.0 =100 X(10x10)

more acidic than pure water.

more on ph1
More on pH…

c. Liquid with a pH of 8.0 is ten times more basic

than pure water.

d. Liquid with a pH of 9.0 is one hundred times more

basic than pure water.