Title: 25.1 Acids, Bases, and pH
125.1 Acids, Bases, and pH
Read text section 25.1 AFTER Investigation 25.1
225.1 Acids, Bases, and pH
- Your stomach secretes one of the stronger acids,
hydrochloric acid (HCl). - As acidic solutions of digested food leave your
stomach, other organs in your digestive system
secrete bicarbonate, a base. - The added base neutralizes the strong, corrosive
acid.
325.1 Acids, Bases, and pH
- An acid is any substance that produces hydronium
ions (H3O) when dissolved in water. - They react with metals to produce hydrogen gas
(H2) - They change the color of a plant dye (called
litmus) from blue to red.
425.1 Acids, Bases, and pH
- A base is any substance that produces hydroxide
ions (OH-) when dissolved in water. - While you should never touch a laboratory
chemical, the bases you use every day such as
soap, have a slippery feel. - They change the color of litmus from red to blue.
525.1 Electrolytes and non-electrolytes
- Electrolytes conduct current.
- All acids and bases are electrolytes because they
contribute ions to a solution. - Other chemicals do not form ions when they are
dissolved in solution. They are called
non-electrolytes. - Non-electrolytes are not acidic or basic.
- Sugar dissolved in water is an example of a
non-electrolyte.
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725.1 Acids and bases in your body
- It is very important for your blood pH to stay
within the normal range. - The rate at which you breathe controls the
concentration of carbon dioxide in your blood.
825.2 Acid Rain
- Any rain, snow, or fog that has a pH lower than
5.6 is called acid rain or acid precipitation.
925.2 Acid Rain
- Acid rain is harmful to natural environments
because most life and life processes function in
nearly neutral environments. - Acid rain reduces the amount of calcium in the
soil.
1025.2 Catalytic converter
- A catalytic converter is a device that converts
nitrogen oxide to nitrogen gas (N2) and oxygen
(O2) before these emissions enter the atmosphere.
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1225.2 Acid Rain
- Key Question
- What is acid rain?
Read text section 25.2 BEFORE Investigation 25.2
1325.2 Acid Rain
- Key Question
- What is acid rain?
Read text section 25.2 BEFORE Investigation 25.2