Answer: 
Explanation: All the Arrhenius and Bronsted Lowry acids release ions in solution.
According to Arrhenius and Lowry, acids are substances which release ions when dissolved in water.
Thus 
all are considered as acids,
<span>When pKas of polyprotic intermediates have a difference of 2 or more you just average them using the equation: pH = (pKa2 + pKa3) / 2 </span>
<span>pKa2 = -log(Ka2) ; pKa3 = -log(Ka3) </span>
<span>so, for this problem, REGARDLESS OF THE CONCENTRATION GIVEN, the answer is: </span>
<span>pH = (7.2076+12.3767) / 2 </span>
<span>pH = 9.79</span>
Answer:
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