Question

clicker question
which one is the stronger acid, ph₃ or h₂s?
a. ph₃
b. h₂s
c. both have the same acid strength.

Explanation:

To determine the stronger acid between \(PH_3\) and \(H_2S\), we consider the stability of their conjugate bases. When \(H_2S\) donates a proton (\(H^+\)), it forms \(HS^-\). When \(PH_3\) donates a proton, it forms \(PH_2^-\). Sulfur (\(S\)) is more electronegative than phosphorus (\(P\)). The more electronegative atom can better stabilize the negative charge in the conjugate base. Also, \(S\) is larger than \(P\) (as we move across a period from \(P\) (group 15) to \(S\) (group 16) in the third - period of the periodic table), and a larger atom can spread out the negative charge over a larger volume, increasing the stability of the conjugate base. A more stable conjugate base means the acid is stronger.

Answer:

B. \(H_2S\)