Acid–Base Indicators ·
Color at a Threshold
un
seel
.com · HIn ⇌ In⁻ · pKa · endpoint
pH
1.0
pKa
9.4
form
HIn
stage
—
acid form HIn (colorless)
base form In⁻ (pink)
added OH⁻ titrant
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.com · Acid–Base Indicators