Question

Rank the following compounds in order of decreasing acid strength using periodic trends.Rank the acids from strongest to weakest. To rank items as equivalent, overlap them.HCL ; H2S ; HI ; LiH

Answer 1

Hi,

Ranking these compounds in order of decreasing acid strength applying periodic trend will be; HI, HCL, H2S; LiH

Step-by-step explanation

When ranking these compounds according their acid strength we use the acid association constant (pKa) of each compound at room temperature and observer them.When the constant is lower, the more the acidic the compound is.In the above case, comparing the pKa values;

HI= -10

HCL= -8

H2S=7

LiH=42

Hope this helps!