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OpenStudy (anonymous):
I need help with this chem homework, can someone please help me? The pKa of phenolphthalein is 9.10. Over what pH range does this indicator change from 95% HIn to 95% In-?
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OpenStudy (jfraser):
do you know the henderson-hasselbalch equation? the percentages let you plug in values for [A-]/[HA]
OpenStudy (anonymous):
No can you tell me, I am not really good at this chemistry, can you help me
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