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Theory of Indicators

Theory of Indicators. HInd (aq) ⇌ H + (aq) + Ind - (aq) Colour 1 Colour 2 K ind = [H + ][Ind - ]/[HInd] log 10 K ind = log 10 [H + ] + log 10 ([Ind - ]/[HInd]) -log 10 K ind = -log 10 [H + ] + -log 10 ([Ind - ]/[HInd]) pK Ind = pH – log 10 ([Ind - ]/[HInd])

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Theory of Indicators

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  1. Theory of Indicators HInd (aq) ⇌ H+ (aq) + Ind- (aq) Colour 1 Colour 2 Kind= [H+][Ind-]/[HInd] log10 Kind = log10 [H+] + log10 ([Ind-]/[HInd]) -log10 Kind = -log10 [H+] + -log10 ([Ind-]/[HInd]) pKInd = pH – log10 ([Ind-]/[HInd]) log10 ([Ind-]/[HInd]) = pH- pKInd

  2. Theory of Buffers HA (aq) ⇌ H+ (aq) + A- (aq) KA= [H+][A-]/[HA] log10 KA = log10 [H+] + log10 ([A-]/[HA]) -log10 KA = -log10 [H+] + -log10 ([A-]/[HA]) pKA = pH – log10 ([A-]/[HA]) pH = pKA- log10 ([HA]/[A-])

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