Determine the hydronium ion concentration in a solution that is 0.0005 m hcl. answer in units of m.

H₃O ions are when water is protonated

H₂O + H⁺ - - > H₃O⁺

HCl is a strong acid therefore complete ionisation takes place.

HCl - - - > H⁺ + Cl⁻

1 mol of HCl dissociates to give out 1 mol of H⁺

since H⁺ together with water forms H₃O⁺ ions,

[HCl] = [H₃O⁺]

therefore concentration of [H₃O⁺] is 0.0005 M