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Question

Use the periodic table to answer the question.

























Based on patterns in the periodic table, which list shows the acids in order from strongest to weakest?

(3 points)
Responses

H2S, PH3, HCl
H 2 S, PH 3 , HCl

HCl, PH3, H2S
HCl, PH 3 , H 2 S

PH3, H2S, HCl
PH 3 , H 2 S, HCl

HCl, H2S, PH3

1 answer

To determine the strength of the acids from the provided options, we need to consider their ability to donate protons (H⁺) in solution, which correlates with their electronegativity and the stability of the corresponding conjugate base.

  1. HCl (Hydrochloric acid): A strong acid that completely dissociates in water, making it the strongest acid of the three listed.
  2. H₂S (Hydrosulfuric acid): A weak acid that does not fully dissociate in solution, but is stronger than PH₃.
  3. PH₃ (Phosphine): Although sometimes referred to in acidic contexts, it does not act as a significant acid in aqueous solution and is much weaker than H₂S.

Given this information, the correct order of strength from strongest to weakest is:

HCl, H₂S, PH₃

Thus, the correct response is:

HCl, H2S, PH3.