1.

State the pH of a mixture of a polyprotic weak acid and a strong acid.

Answer»

pH of a mixture of a polyprotic weak acid and a strong acid :

  • pH can be calculated by taking the concentration of strong acid only (for first approximation)
  • For precise calculation we should take only the first dissociation constant of the weak polyprotic acid. (As can be predicted from the equations we have presented so far for different cases.) 
  • All these steps can be followed for the calculation of pOH for weak base and their mixtures (we just have to replace Ka with Kb)


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