Chemical and Ionic Equilibrium - Result Question 137

####79. How many moles of sodium propionate should be added to 1L of an aqueous solution containing 0.020 mole of propionic acid to obtain a buffer solution of pH4.75 ? What will be pH if 0.010 moles of HCl are dissolved in the above buffer solution? Compare the last pH value with the pH of 0.010MHCl solution. Dissociation constant of propionic acid, Ka at 25C is 1.34×105.

(1981, 4M)

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Solution:

  1. For acidic buffer, the Henderson’s equation is

$$ \begin{gathered} pH=p K _a+\log \frac{(\text { mole of salt })}{(\text { mole of acid })} \



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