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Question F3 part A asks "(a) Write the formula for nitric acid." Is this a formula that we are already supposed to know? If not, how does one know the formula without actually calculating the empirical/molecular formulas?
I think you're technically supposed to know it because it is basically a nitrate ion (NO3-) with an added hydrogen atom. It tends to come up fairly often in chemistry, so it's really helpful to have it memorized. Assuming that the polyatomic ion that is being protonated ends with -ate (like nitrate), the acid would end in -ic (like nitric acid).
nitric acid falls under the table of memorizing specific ions and their acid/base compounds. Even if you do not perform the calculations for finding empirical formula, nitric acid is derived from the the combination of N and O, for which we have to memorize the ions. Then, you simply add H+ as it is an acid.
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