An amphoteric salt is one that contains an anion that can act as either an acid

Question

An amphoteric salt is one that contains an anion that can act as either an acid or a base in water Baking soda, NaHCO3, is an example. By combining the ionization and hydrolysis reactions of the anion, we get the principle reaction that occurs when this salt is dissolved in water. ????;(aq) CO:-(aq) + H2CO3(aq) The pH for such a solution is given by pKi+pKre Kat and Ka2e the onization constants of the acid (in this case, H2CO3). Note that the pH of the solution is independent of the salt concentration 2 Calculate the pH of a NaHCO3 solution Number

Explanation / Answer

For H2CO3pKa1 = 6.37

and pKa2 = 10.32

Hence pH of NaHCO3 pH = (6.37+10.32)/2

pH = 8.34

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