Concentrations of hydroxonium etc (SB-46) Given a solution A with pH = 7 as well as a solution B with pH = 8. Assess (right or wrong) the following statements: (a) the H3O+-Konzentration of A is ten times greater than that of solution B (b) the H3O+-Konzentration of A is equal to OH– Concentration of A (c) the H3O+-Konzentration of B is ten times smaller than that of c(OH–) the solution B

  Aufgabe: SB-46    

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Given a solution A with pH = 7 as well as a solution B with pH = 8. Assess (right or wrong) the following statements:

1. (a) the H₃O⁺-Konzentration of A is ten times greater than that of solution B
2. (b) the H₃O⁺-Konzentration of A is equal to OH^– Concentration of A
3. (c) the H₃O⁺-Konzentration of B is ten times smaller than that of c(OH^–) the solution B

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Lösung:

1. (a) correctly
       pH = 7 → c(H₃O⁺) = 10^-7 mol/l;
       pH = 8 → c(H₃O⁺) = 10^-8 mol/l
2. (b) correct
       especially at pH=7, c(H₃O⁺) = c(OH^–)
3. (c) wrong.
       pH=8 → c(H₃O⁺) = 10^-8 mol/l;
       pOH = 14-pH = 6 → c(OH^–) = 10^-6 mol/l
       so c is(H₃O⁺) 100· times less than c(OH^–)

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