Acids and Bases_2

Acids and Bases_2

Acids
1. release positively charged hydrogen atoms when dissolved in water
  1. when the hydrogen atoms combine with water molecules, hydronium ions form
2. can conduct electricity
3. some can eat away metals (corrosive)
4. a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and red litmus paper blue, and the ability to react with bases and certain metals (like calcium) to form salts. Aqueous solutions of acids have a pH of less than 7.
5. when an acid and a base react, they form a salt
Bases
1. contain hydrogen, but form hydroxide ions when dissolved in water
2. can conduct electricity since they contain ions
3. can't eat away metals (not corrosive), since hydroxide ions don't react with metal
4. substances that, in aqueous solution, are slippery to the touch, taste bitter, change the color of indicators (e.g., turn red litmus paper blue and blue litmus paper red) and react with acids to form salts. Aqueous solutions of bases have a pH of more than 7.
5. when an acid and a base react, they form a salt
Acid rain
1. rain affected by pollution
2. harms ecosystems and the environment
3. volcanos, forest fires and lightening strikes are natural contributers to acid rain
pH scale
1. buffers
  1. can block changes in pH for a period of time
  2. are made by combining weak acids and weak bases, and also can occur naturally
2. measures the potential of hydrogen (or the acidity of a solution)
3. <7 is an acid
4. 7 is neutral
5. >7 is a base

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