P4-3 - Chemical and Biological Properties of the Soil...

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Chemical and Biological Properties of the Soil
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Lesson Objectives Describe the properties of acids and bases. Differentiate between strong and weak acids, strong bases and weak bases. Use the pH scale to calculate and measure the concentration of oH. Relate soil pH to nutrient availability.
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Investigate the effect of soil pH on plant growth. Develop a plan for changing soil pH to meet crop needs. Determine how to take a soil sample for testing. Lesson Objectives continued
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What is the pH scale? The pH scale measures how acidic or basic a solution is.
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The pH scale The pH scale is the concentration of hydrogen ions in a given substance. [ ] + - = H pH log
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Identifying Acids and Bases Acids have a ph from 0-7 Lower pH value indicates a stronger acid. Bases have a pH from 7-14 Higher pH value indicates a stronger base.
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Definitions of Acids and Bases An acid is a substance that breaks into ions in an aqueous solution. A Base (alkaline) is a substance that breaks into ions in an aqueous solution. Note: aqueous solution is any solution where is the solvent. [ ] + H [ ] - OH [ ] - OH O H 2
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P4-3 - Chemical and Biological Properties of the Soil...

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