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The hydrogen ion concentration of a 10-8 M HCl aqueous solution at 298 K (Kw =10-14) is       

(a) 1.0 x10-6 M                     (b) 1.0525 x 10-7 M

(c) 9.525 x 10-8 M                (d) 1.0 x10-8 M