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Acids/Bases/ & Acid Rain

Acids/Bases/ & Acid Rain. How to Recognize Acids & Bases . ACIDS BASES H + hydrogen ions OH - hydroxide ions w/ a metal* Ex. HCl , H 2 SO 4 , HNO 3 Ex . NaOH , LiOH , Ca(OH) 2 ,

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Acids/Bases/ & Acid Rain

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  1. Acids/Bases/ & Acid Rain

  2. How to Recognize Acids & Bases • ACIDSBASES • H+hydrogen ions OH- hydroxide ions w/ a metal* • Ex. HCl, H2SO4, HNO3 Ex. NaOH, LiOH, Ca(OH)2, • other ex.’s= citrus fruits *visual exception NH3(aq) other ex= household cleaners • Acids taste sour Bases taste bitter • Litmus test ends REDLitmus test ends Blue

  3. How to measure STRENGTH of Acids and Bases • pH scale: power of H+ ions 0 up to 7=Acidic 7= Neutral >7 to 14= Basic Strong Acids are near 0, Strong Bases near 14

  4. Neutralization • Acids react with Bases in a neutralization reaction to form water HOH (and a salt) • Ex. HCl + NaOH HOH + NaCl • Pure water is neutral; equal concentrations of the H+ and OH- ions • As OH- are added to H’s, HOH or water forms and the pH of the solution “heads UP towards 7” • Ex. Start at pH=4 (acidic; more H’s than OH’s). Add OH-, water forms and final pH can be 6 • As H’s are added to OH’s, HOH or water forms and the pH “heads towards DOWN towards 7”

  5. Acid Rain Background • CO2 + H2O  H2CO3 carbon dioxide gas reacts with water to form WEAK carbonic acid. Although slightly acidic, this is considered NORMAL rainwater • SO2 + H20  H2SO4 sulfur dioxide gas reacts with water to form sulfuric acid. This is highly acidic and = ACID rain. Rainwater with a pH less than 5.5 is considered Acid Rain. This gas enters the atmosphere mainly from coal power plants and industrial smokestacks • NOx + H2O  HNO3 nitrous oxides react with water to form nitric acid. This is highly acidic and= ACID rain. These gases enter the atmosphere mainly from vehicle emissions

  6. Acid Rain

  7. Acid Rain’s Effect

  8. Acid Rain and Lakes

  9. Acid Rain and Forests

  10. Acid Rain’s Effect on Stone • Limestone and Marble w/CaCO3 is very susceptible to acid rain • Sandstone, granite, and other materials without CaCO3 : Not affected by acid rain • The lettering on this marble Stone has been weathered by acid rain

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