When equal moles of the following acids are dissolved in 1 L of H 2 O, which acidic solution will have lowest concentration of ions? HI HF HClO4 HNO 3 HCl Please explain why! Solution All the acids given are the strongest acids. But among all, HI > HBr > HClO 4 > HCl > HNO 3 The above order it the acidic strength. Among all the given acids, HI is the strongest and HNO3 is the weakest. Strongest acid dissociates completely in H 2 O (There will not be any undissociated molecule). But due to the common ion effect(H + ), the HNO 3 acid will have lowest concentrations of ions. Thanks and hope u got the answer. .