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CASE 3.2 Principles of pH

CASE 3.2 Principles of pH. What is pH?. pH is the measure of acidity or alkalinity in a soil . Acid is a term used for a substance with a pH value less than 7.0. Alkaline (aka, Base) is a term used for a substance with a pH value greater than 7.0. pH Scale.

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CASE 3.2 Principles of pH

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  1. CASE 3.2 Principles of pH

  2. What is pH? • pH is the measure of acidity or alkalinity in a soil. • Acid is a term used for a substance with a pH value less than 7.0. • Alkaline (aka, Base) is a term used for a substance with a pH value greater than 7.0.

  3. pH Scale • pH is measured on a scale of 0 - 14 • pH value of 7.0 is neutral

  4. pH Scale • The pH scale is special in that each pH point multiplies the pH factor by 10. • For example: • A pH of 5.0 is 10 times more acidic than pH 6.0 and 100 times more acidic than pH 7.0. • Distilled water would be an example of a pH neutral substance.

  5. Who cares about pH? • Plant producers • A correct soil pH allows plants to uptake soil nutrients required for growth and health. • Certain soil nutrients become unavailable at different pH levels. • If pH is not optimal for the plant, many nutrients added in the form of fertilizer are washed away rather than used for plant growth and health. • Animal producers • Nutrient uptake in digestion • Agricultural scientists • Food preservation

  6. Buffers • Chemical substances that neutralize acids or bases when added to a solution

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