Consider the following data on some weak acids and weak bases: acid base name fo

Question

Consider the following data on some weak acids and weak bases: acid base name formula name formula acetic acid HCH,CO hydroxylamine HONH hydrofluoric acid HF 6.8 x 10 aniline 61sH24.3x 10-10 Use this data to rank the following solutions in order of increasing pH. In other words, select a '1 next to the solution that will have the lowest pH, a '2" next to the solution that will have the next lowest pH, and so on solution pH 0.1 M KCH3CO2 choose one 0.1 M C6H5NH3Br choose one 0.1 M NaF choose one 0.1 M HONH3Cl choose one

Explanation / Answer

Larger the Ka, more the acid dissociates i.e. stronger is the acid ( same is for bases)

Thus, HF is a stronger acid than acetic acid. Similarly, hydroxylamine is a stronger base than aniline. Using this data,we can conclude the pH of solutions

The increasing order of pH for the given solutions will be:

C6H5NH3Br< HONH3Cl<KCH3COO<NaF

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