Precizeaza caracterul solutiei in urmatoarele cazuri
a. pH=2
b. pOH=9
c. pH=pOH=7
d. [H₃O⁺]=10⁻²mol/L
e. [HO⁻]=2·10⁻²mol/L
f. [H₃O⁺]=10⁻⁷mol/L

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