Calculate the pH of a solution that contains the following analytical concentrations:
(a) 0.0500 M in H3PO4 and 0.0200 M in NaH2PO4.
(b) 0.0300 M in NaH2AsO4 and 0.0500 M in Na2HAsO4.
(c) 0.0600 M in Na2CC3 and 0.0300 M in NaHCC3.
(d) 0.0400 M in H3PO4 and 0.0200 M in Na2HPO4.
(e) 0.0500 M in NaHSO4 and 0.0400 M in Na2SO4.
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