Lesson 3.2 Principles of pH

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Presentation transcript:

Lesson 3.2 Principles of pH What is pH? Introduction to Agriculture, Food, and Natural Resources Unit 3 Lesson 3.2 Principles of pH What is pH? Lesson 3.2 Principles of pH Curriculum for Agricultural Science Education Copyright 2011

What is pH? pH is the measure of acidity or alkalinity in a soil. Introduction to Agriculture, Food, and Natural Resources Unit 3 Lesson 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. Definitions are essential for pH concepts. Curriculum for Agricultural Science Education Copyright 2011

pH Scale pH is measured on a scale of 0 - 14 What is pH? Introduction to Agriculture, Food, and Natural Resources Unit 3 Lesson 3.2 Principles of pH pH Scale pH is measured on a scale of 0 - 14 pH value of 7.0 is neutral Curriculum for Agricultural Science Education Copyright 2011

What is pH? Introduction to Agriculture, Food, and Natural Resources Unit 3 Lesson 3.2 Principles of pH 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. Let’s try another pH calculation: How many times more alkali is 9.0 from 6.0? (1000 times) Curriculum for Agricultural Science Education Copyright 2011

Who cares about pH? Plant producers Animal producers What is pH? Introduction to Agriculture, Food, and Natural Resources Unit 3 Lesson 3.2 Principles of pH 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. Animal producers Nutrient uptake in digestion Agricultural scientists Food preservation pH is an important consideration for many agricultural industries because pH is important in the nutrient availability in plants and animals. It influences the efficiency of plants to utilize fertilizers added for optimal growth. 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. Curriculum for Agricultural Science Education Copyright 2011

What is pH? Introduction to Agriculture, Food, and Natural Resources Unit 3 Lesson 3.2 Principles of pH Buffers Chemical substances that neutralize acids or bases when added to a solution Curriculum for Agricultural Science Education Copyright 2011