MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryIonic equilibriumSelf-ionization of Water
The hydrogen ion concentration of a 10–8 M HCl aq. solution at 298K (Kw = 10–14) is (a) 1.0 10 M x (b) 1.10 10 M x (c) 9.525 10 M x (d) 1.0 10 M x
Answer
B
Explanation
In aqueous solution of 10–8 M HCl, [H+] is based upon the concentration of H+ ion of 10–8 M HCl and concentration of H+ ion of water. Kw of H2O = 10–14 = [H+][OH–] Or [H+] = 10–7 M (due to its neutral behaviour) So, in aqueous solution of 10–8 M HCl, [H+] = [H+] of HCl + [H+] of water 8 7 8 10 10 11 10 M x 7 1.10 10 M. x
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