Lecture 14 - HIn + H2O H3O+ + In[H 3O + ][In ] K HIn =...

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1 HIn + H 2 O H 3 O + + In - ] HIn [ ] In ][ O H [ K 3 HIn + = ] HIn [ ] In [ log pK pH 10 HIn + = (Low pH) (High pH)
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2 Colors of Indicators depend upon pH
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3 Titration: Measurement of the number of moles of acid or base in a sample. Involves neutralization using known quantities of base or acid. Equivalence point: moles acid = moles base. Endpoint: point at which indicator undergoes color change. Titration of 25.0ml of 0.10 M HCl Strong acid + strong base: pH = 7 at equivalence pt. Volume of 0.100M NaOH, mL
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4 Equivalence point: moles acid = moles base Endpoint : Point at which color of indicator changes. Choose indicator such that endpoint coincides with equivalence point. Titration of 25.0ml of 0.10 M HCl Volume of 0.100M NaOH, mL Best Indicator choice (Equiv. pt. = Endpoint) Poor Indicator choice (Equiv. pt. Endpoint)
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5 Titration of a weak acid using NaOH pH > 7 at equivalence point (moles base = moles acid) Good indicator choice (Equiv. pt. = Endpoint) Poor indicator choice (Endpoint reached BEFORE equiv. pt) Titration of 25.0 ml of 0.100 M Acetic Acid
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Lecture 14 - HIn + H2O H3O+ + In[H 3O + ][In ] K HIn =...

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