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pH Read pp
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What is pH and pOH? pH A measure of how acidic a solution is, or more specifically, how much H+ ions are present Key Idea: The more H+ ions present, the more acidic the solution pOH A measure of how basic a solution is (how much OH- ions are present) Key Idea: The more OH- ions present, the more basic the solution
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[H+] (mol/L)
![[H+] (mol/L)](http://slideplayer.com/slide/15773738/88/images/3/%5BH%2B%5D+%28mol%2FL%29.jpg "[H+] (mol/L)")
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Each step on the scale is either 10 times stronger or weaker. (eg
Each step on the scale is either 10 times stronger or weaker. (eg. 3 steps on the scale = 10x10x10 = 1000 times stronger or weaker) As you get closer to pH=0, it is more acidic. If it gets closer to pH=14, it is more basic. Neutral is when the pH=7.
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pH Strength and Weakness
How many times stronger is a solution that is pH=2 compared to a solution that is pH=6? How many times weaker is a solution that is pH=9 compared to a solution that is pH=3?
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Calculations pH = - log[H+] [H+] = 10-pH
To find pH (or pOH): To find [H+] (or [OH-]) pH = - log[H+] [H+] = 10-pH pOH = - log[OH-] [OH-] = 10-pOH Note: pH + pOH = 14
![Calculations pH = - log[H+] [H+] = 10-pH](http://slideplayer.com/slide/15773738/88/images/7/Calculations+pH+%3D+-+log%5BH%2B%5D+%5BH%2B%5D+%3D+10-pH.jpg "To find pH (or pOH): To find [H+] (or [OH-]) pH = - log[H+] [H+] = 10-pH. pOH = - log[OH-] [OH-] = 10-pOH. Note: pH + pOH = 14.")
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What is the pH if… [H+] = mol/L? [OH-] = mol/L?
![What is the pH if… [H+] = mol/L [OH-] = mol/L](http://slideplayer.com/slide/15773738/88/images/8/What+is+the+pH+if%E2%80%A6+%5BH%2B%5D+%3D+mol%2FL+%5BOH-%5D+%3D+mol%2FL.jpg "What is the pH if… [H+] = mol/L [OH-] = mol/L")
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What is the pOH if… [OH-] = 0.25 mol/L? [H+] = mol/L?
![What is the pOH if… [OH-] = 0.25 mol/L [H+] = mol/L](http://slideplayer.com/slide/15773738/88/images/9/What+is+the+pOH+if%E2%80%A6+%5BOH-%5D+%3D+0.25+mol%2FL+%5BH%2B%5D+%3D+mol%2FL.jpg "What is the pOH if… [OH-] = 0.25 mol/L [H+] = mol/L")
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Calculate [H+] if… pH = 3.4 pOH = 8.1
![Calculate [H+] if… pH = 3.4 pOH = 8.1](http://slideplayer.com/slide/15773738/88/images/10/Calculate+%5BH%2B%5D+if%E2%80%A6+pH+%3D+3.4+pOH+%3D+8.1.jpg "Calculate [H+] if… pH = 3.4 pOH = 8.1")
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Calculate [OH-] if… pOH = 11.4 pH = 4.5
![Calculate [OH-] if… pOH = 11.4 pH = 4.5](http://slideplayer.com/slide/15773738/88/images/11/Calculate+%5BOH-%5D+if%E2%80%A6+pOH+%3D+11.4+pH+%3D+4.5.jpg "Calculate [OH-] if… pOH = 11.4 pH = 4.5")
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