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The definition of pH is the -log[H+], which basically means the negative common log (base 10) of the concentration of hydronium ions in solution. Since nitric acid is a strong monoprotic acid (one H+) it makes the problem so much easier since there is no acid equilibrium to deal with. Since there is one H+ for every acid molecule thus the [H+], or concentration of H+, is equal to the concentration of the acid, which is given to be 0.2004M. Thus, pH = -log[H+] = -log(0.2004) = (with sig figs) 0.6981 pH, something you really don't want to stick your hand in, but not as bad as some acid I've seen (yay, negative pH!).

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11y ago

- log(0.200 M HNO3)

= 0.700 pH

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Q: What is the pH of a 0.200 M solution of HNO3?
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