Browse Questions

# Which of the following ionic species has the greatest protons affinity to form stable compound?

(a) $I^-$

(b) $HS^-$

(c) $NH^-_2$

(d) $F^-$

Toolbox:
• Strongest proton affinity will be for species wich is the strongest base or whose conjugate acid is the weakest.

Answer: $NH^-_2$

The conjugate of $NH^-_2$ is $NH_3$ which is the weakest acid out of HI, $H_2S$, $NH_3$ and HF.