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Attention: At the end of this list of exercises, we have 4 consecutive questions about Salt Hydrolysis from ENEM involving calcium salts (especially Calcium Carbonate). All of them talk about soil pH correction. Needless to say, they love asking about this. 2 final questions about more advanced calculations involving ionization equilibrium of weak acids. Note that two ways of solving were given. In Enem, until 2020, there were no questions of this type... but... anything can happen.