Answer:
1) [H₃O⁺] = {HCl] = 0.0045 M.
2) [OH⁻] = 2.22 x 10⁻¹² M.
3) pH = 2.346.
Explanation:
HCl is completely dissociated yo its ions in solution:
HCl + H₂O → H₃O⁺ + Cl⁻,
1) [H₃O⁺] = {HCl] = 0.0045 M.
2) [OH⁻]:
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺] = 10⁻¹⁴/(0.0045 M) = 2.22 x 10⁻¹² M.
3) pH:
For strong acids like HCl:
pH = - log[HCl] = - log[0.0045 M] = 2.346.
