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

Question

(1 point)
H S, PH , HCl 2 3
PH , H S, HCl 3 2
HCl, H2S, PH3
HCl, PH3
, H2S

Answer 1

To determine the strength of the acids H2S, PH3, and HCl, we can use their positions in the periodic table and their intrinsic properties.

• HCl (hydrochloric acid) is a strong acid, as it completely dissociates in water to produce H⁺ ions.
• H2S (hydrosulfuric acid) is a weak acid, as it does not fully dissociate in water.
• PH3 (phosphine) is not considered an acid in the same sense as HCl or H2S; it is generally a very weak base and does not donate protons readily.

Given this understanding, the order from strongest to weakest acid is:

HCl > H2S > PH3

Thus, among your options, the correct order appears to be:

HCl, H2S, PH3.