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Published byReece Whittier Modified over 2 years ago

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pH and pOH Ways to measure Acidity/Basicity What is pH? What is pOH?

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What is pH? pH = potential Hydrogen The pH scale measures how acidic or basic a substance is, is logarithmic The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic, greater than 7 is basic.

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Basic Equations pH + pOH = 14 K w = [H+] [OH-] = 1 x 10 -14

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Calculating pH Values pH = 14 – pOH pH = - log [H+] Example: Calculate pH given [H+] = 1.4 x 10 -5 M pH = - log [H+] pH = - log [1.4 x 10 -5 ] pH = 4.85

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Calculating [H + ] values EXAMPLE: Find [H+] if pH = 8.5 [H+] = 10 -pH [H+] = 10 -8.5 [H+] = 3.2 x 10 -9 M

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Calculating pOH pOH = 14 – pH pOH = -log[OH-] EXAMPLE: What is the pOH of a solution that has a hydroxide ion concentration of 4.82 x 10 -5 M ? pOH = - log [OH - ] pOH = - log [4.82 x 10 -5 ] pOH = 4.32

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YOU TRY! Find the pH of the solution if [H+] = 1 x 10 -4 M What is the hydrogen ion concentration if pH = 7.1? What is the pH if [OH-] = 4 x 10 -11 M? pH = 4 7.1 = -log [H + ] 10 – 7.1 = [H + ] = 7.9 x 10 -8 M pOH = -log [OH-] pOH = -log [4 x 10 -11 ] =

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