Rank the following binary acids according to increasing acid strength, based on the factors identified in part 1. For compounds with more than one ionizable H, consider the loss of a single H + only. NH3, HCl, PH3, H2S, HI

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Chemistry

Serena

9 March, 07:53

Rank the following binary acids according to increasing acid strength, based on the factors identified in part 1. For compounds with more than one ionizable H, consider the loss of a single H + only. NH3, HCl, PH3, H2S, HI

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Answers (1)

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Bianca Pineda · Answer 1

Answer: HCl>HI>H2S>PH3>NH3

Explanation:

There are two factors that determine acidity, viz; bond dissociation energy and solvation of conjugate base. In discussing aqueous acids, solvation takes preeminence because the smaller its conjugate base the greater the PKa of the specie. This explains the ordering of species above. The specie that produces the smallest conjugate base will have the higher PKa and this the highest acid strength. Cl - is the smallest conjugate base hence HCl is the strongest acid. The trend continues as shown.