Question

can anyone send me all formulas for cacualting ph of every type of mixture in ionic equilibrium

Answer 1

 Calculation of pH of a Buffer Mixture

Calculation of pH of a Buffer Mixture

By Mrs Shilpi Nagpal  On September 5, 2017 In Chemistry, Class 11, Ionic Equilibrium Tagged buffer capacity, calculation of pH of acidic buffer mixture, calculation of pH of basic buffer mixture, Henderson- Hasselbalch equation, importance of buffer solution Leave a comment 

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For Acidic Buffer mixture( Henderson- Hasselbalch equation)





For Basic Buffer mixture

pOH = pKb + log [salt] / [Base]

pH + pOH =14

pOH = 14 – pH

pKa + pKb = 14

pKb=14 – pKa

14 – pH = 14 – pKa + log [salt) / [base]

pH = pKa – log [salt] / [base]

pH = pKa + log [base] / [salt]

where Ka is the ionization constant of the conjugate acid of the base.

For ex: In the buffer NH4OH + NH4Cl , NH4+ is the conjugate acid of the base, NH3 and Ka represents the ionization constant of the reaction:

NH4+ (aq) + H2O (l)  NH3 (aq) + H+ (aq)

pH = pKa + log [NH3] / [NH4+]

pH = pKa + log [Base] / [conjugate acid