JEE Main Chemistry question

Chemistry Equilibrium JEE Main

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

(A)9.525×10⁻⁸ M
(B)1.0×10⁻⁸ M
(C)1.0×10⁻⁶ M
(D)1.0525×10⁻⁷ MCorrect

Answer: (D)

Solution

At this extreme dilution: [H⁺]=(Ca+√(Ca²+4Kw))/2≈1.05×10⁻⁷ M.

Question ID VK-136487