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

  • 1.0 x 10-6

  • 1.0525 x 10-7 M

  • 9.525 x 10-8 M

  • 1.0 x 10-8 M

Answer

B.

1.0525 x 10-7 M

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 neutral behaviour) os, in aqueous solution of 10-8 M HCl,
[H+] = [H+] of HCl +[H+] of water
= 10-8 + 10-7 = 11 x 10-8 M
1.10 x 10-7 M

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