sw26 - Students in yesterdays 12:50 lab Please see me for a...

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Students in yesterday’s 12:50 lab. Please see me for a moment after class
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Soil Buffering and Management of Acid Soils
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Acid Any substance which increases the Hydrogen ion concentration in solution. H + Acidity is expressed as pH
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pH pH = - log (H + ) If (H + ) = 1 x 10 -3 mol/L (H + ) = 0.001 mol/L pH = - log (1 x 10 -3 ) pH = - (-3) pH = 3 pH = - log (H + ) If (H + ) = 1 x 10 -5 mol/L (H + ) = 0.00001 mol/L pH = - log (1 x 10 -5 ) pH = - (-5) pH = 5 Low pH = high hydrogen ion concentration
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Acid Any substance which increases the Hydrogen ion concentration in solution. The opposite of acids are BASES
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H + OH - H + H + H + H + H + H + H + H + H + OH - OH - OH - OH - OH - OH - OH - OH - OH - Acid (=10) Base(=10) 0 7 14 Acidic basic When acids and bases are in equal amounts, pH = 7
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H + OH - H + H + H + H + H + H + H + H + H + OH - OH - OH - OH - OH - Acid (=10) Base (=6) 0 7 14 Acidic basic When acids exceed bases pH < 7
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H + OH - H + H + H + H + H + H + H + H + H + OH - OH - OH - OH - OH - OH - OH - OH - OH - Acid (=10) Base(=15) 0 7 14 Acidic basic OH - OH - OH - OH - OH - When bases exceed acids pH > 7
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1. Acids increase the H + ion concentration in solution 2. Bases are the opposite of acids 3. Bases neutralize acids. 4. When acids and bases are in equal amounts in a solution, the pH is 7. Neutral pH. 5. When the number of acids exceeds the number of bases the pH is lowered. (acid conditions) 6. When the number of bases exceeds the number of acids, the pH is raised. (basic/alkaline conditions)
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Two types of acidity in soils: Active Acidity Exchangeable Acidity
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5.6 pH meter 0 7 14 Acidic basic Active Acidity
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Exchangeable Acidity Acidity associated with cation exchange sites on mineral or organic colloids.
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sw26 - Students in yesterdays 12:50 lab Please see me for a...

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