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irina irina
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Posts: 919
12 years ago
At what pH value does the ratio of the basic form In- to the acidic form HIn of methyl orange indicator (pKa = 4.2) have the value 1.0 : 5.0?
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wrote...
12 years ago
pH = pKa + log (base / acid)

pH = 4.2 + log (1 / 5)

pH = 4.2 + (-0.7)

pH = 3.5
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