Use the periodic table to answer the question.

Question

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

(3 points)
Responses

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

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

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

HCl, PH3, H2S

Answer 1

To determine the strength of the acids in the given list (HCl, H2S, PH3), we can look at their ability to dissociate and donate protons (H+ ions).

1. HCl (Hydrochloric acid) - This is a strong acid and dissociates completely in solution.
2. H2S (Hydrosulfuric acid) - This is a weak acid; it doesn’t dissociate completely, making it weaker than HCl.
3. PH3 (Phosphine) - While not traditionally classified as an acid, it is very weakly acidic and does not dissociate to donate protons effectively.

Therefore, the order of strength from strongest to weakest acid is:

HCl > H2S > PH3

So, the correct response for the acids in order from strongest to weakest is:

HCl, H2S, PH3.