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pH worksheet (#1)
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
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
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
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
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
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
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
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
PH and pOH Ways to measure Acidity/Basicity What is pH? What is pOH?
Continuing into the world of acids and bases…. pH of a solution is the negative logarithm of the hydrogen ion concentration pH = -log [H + ] This.
pH: The negative of the common logarithm of the hydronium ion concentration [H 3 O + ] ◦ pH stands for the French words pouvoir hydrogene, meaning “hydrogen.
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