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Published byElisabeth Tindle Modified over 2 years ago

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pH worksheet (#1)

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1. What is the pH of a solution with a hydrogen ion concentration of 1.0 x M? pH = -log [H + ] = - log (1.0 x ) = 5

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2. What is the pH of a solution with a hydrogen ion concentration of 4.5 x M? pH = -log [H + ] = - log (4.5 x ) = 7.34

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3. What is the pOH of a solution with a hydrogen ion concentration of 1.0 x M? pH = -log [H + ] = - log (1.0 x ) =10 Now use: pH + pOH = – 10 = 4, so the pOH = 4

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4. What is the pOH of a solution with a hydroxide ion concentration of 1.0 x M? We need to use: pOH = - log [OH-] 1.0 x pOH = - log [ 1.0 x ] pOH = 10

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5. What is the hydroxide ion concentration in a solution with a pH of 5? pH = - log [ H+] - pH = log [ H+] 10 x (- pH) = 10 x log [ H+] 10 x (- 5) = 10 x log [ H+] = [ H+] = 1.0 x M

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This is our [H+], we need [OH-] We need to use: [H+] x [OH-] = 1.0 x M [1.0 x M] x [OH-] = 1.0 x M [1.0 x M] = 1.0 x 10 -9

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6. What is the hydrogen ion concentration in a solution with a pH of 9.7? pH = - log [ H+] - pH = log [ H+] 10 x (- pH) = 10 x log [ H+] 10 x (- 9.7) = 10 x log [ H+] = [ H+] = 2.0 x M

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7. What is the hydronium ion concentration of a solution with a pH of 2.5? pH = - log [ H+] - pH = log [ H+] 10 x (- pH) = 10 x log [ H+] 10 x (- 2.5) = 10 x log [ H+] = [ H+] = 3.2 x M

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