Ph of hcl using molarity

Question

HCl has a concentration of 4.0x10-3mol L-1 what is the pH of this

Answer 1

HCl (aq) → H⁺ (aq) + Cl^- (aq)

HCl is a strong acid, therefore, it will completely dissociate into hydrogen ions (protons = H⁺) and chloride ions in an aqueous solution.

[H⁺] = 4.0 x 10^-3 mol L^-1

pH = - log [H⁺] = - log 4.0 x 10^-3 = 2.40