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

(1 point)
Responses

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

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

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

HCl, H2S, PH3

1 answer

To determine the strength of acids based on their molecular composition, we can consider their behavior in water (their ability to donate protons, H⁺).

  1. HCl (hydrochloric acid) is a strong acid that dissociates completely in water, making it the strongest among the three.
  2. H2S (hydrosulfuric acid) is a weak acid compared to HCl but is still stronger than PH3.
  3. PH3 (phosphine) does not act as an acid in water, making it the weakest of the three.

Therefore, the correct order from strongest to weakest acid is:

HCl, H2S, PH3

So the correct response is: HCl, H2S, PH3