0.2 M each of nitric acid and carbonic acid will have the same pH.
The pH of substances is mathematically given as:
pH - -log [H+]
Nitric and carbonic acid dissociates according to the following:
HNO3 ---------> H+ + NO3-
H2CO3 -------> H+ + HCO3-
Thus, both acids ionizes to produce the same number of moles of H+, thus, producing the same pH
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