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Given be a solution A with pH = 7 and a solution B with pH = 8. Assessment (correct – wrong) of the following statements:
- (a) The H3O+-Konzentration of A is ten times larger than that of solution of B
- (b) The H3O+-Konzentration of A is equal to the OH– concentration of A
- (c) The H3O+-Konzentration of B is ten times smaller than the c(OH–) of solution of B
Solution: - (a) correctly
pH = 7 → c(H3O+) = 10-7 mol/l;
pH = 8 → c(H3O+) = 10-8 mol/l - (b) correct
Specifically at pH=7, c(H3O+) = c(OH–) - (c) wrong.
pH=8 → c(H3O+) = 10-8 mol/l;
pOH = 14-pH = 6 → c(OH–) = 10-6 mol/l
So c(H3O+) is 100· times smaller than c(OH–)
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