identifying the strong acid

[705913589]

Hi, how do we find when one is the stronger acid? For example between HI and HCI, which acid would be stronger?

[Luke_Dreyer 2F]

In this scenario we look at the dissociation energy of the two different bonds because the lower the dissociation energy the stronger the acid. Since HI has a lower dissociation energy than HCl it will be a stronger acid.

[Kyle_Phong_2J]

We can look at the periodic table trend for atomic radius size and see that I > Cl. Therefore, the bond length between H and I is longer and weaker compared to H and Cl. This means it is easier for the H to be donated, so HI is a stronger acid.

[Ari_St_Jacques_3H]

HI will be the stronger acid as it is less electronegative and has a longer bond that will dissociate in water more easily than HCl, more easily creating H30.

[angel oganesyan]

the way i've gone about it is memorization but more technically i believe you should be able to tell by the stability of their conjugate bases because i think the strength of an acid is pretty much inversely related to the strength of its conjugate base. if the base is a strong base, then the acid should be strong, so whichever one has the stronger/more stable conjugate base, which in this case would be HI, is the stronger acid.