An acid-base indicator which is a weak acid has a pKa value = 5.5. At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half-way between those of it's acid and conjugate base forms? [pKa of acetic acid = 4.75]
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Explanation:
pH=5.45, pKa=4.75
pH=pK
a
+log
Aceticacid
(sodiumacetateion)
5.45=4.75+log
acid
base
(Aceticacid)
(sodiumacetateion)
=10
0.7
=5:1
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