Question

1:08 el LTE Question 13 of 32 Submit What is the hydronium-ion concentration of a 0.25 M HCl solution? A) 0.50 M B) 0.25 M C) 4.00 x 10-14 D) 1.00 x 10-7

Answer 1

Ans = B) 0.25 M

HCl is strong acid therefore dissociate completely in water thus mole of HCl and mole of H₃O⁺ are same therefore concentration of HCl = concentration of H₃O⁺

HCl + H₂O   $\rightarrow$ H₃O⁺ + Cl^-

therefore

[HCl] = [H₃O⁺] = 0.25 M