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Unformatted text preview: 2 CO 3 diprotic) Formic acid (HCHO 2 ) Phosphoric acid (H 3 PO 4 triprotic) pH (relative to pK a ) [In-]/[HIn] ratio Color of Indicator Solution pH = pK a Ratio = 10 = 1 Intermediate color pH = pK a + 1 Ratio > 101 = 10 Color of In-pH = pK a 1 Ratio < 10-1 = .10 Color of HIn * a The pH is only relative to the pK a if the ratio is equal to the given number...
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