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pH= 3 --> pOH= 11 --> [OH-]a= 10^-11
pH= 5 --> pOH= 9 --> [OH-]b= 10^-9
Karena diaanya perbandingan [OH-] atau hidroksida, maka:
[OH-]a : [OH-]b
10^-11 : 10^-9
0,01 : 1 atau 1 : 100