A mixture is made by mixing 50.0 ml of 0.200 m hcl and 50.0 ml of water. what is its ph?

HCl is a strong base therefore it completely dissociates to H⁺ and Cl⁻ ions.

To calculate pH we need to know [H⁺]

number of HCl moles in 50.0 mL - 0.200 M / 1000 mL/L x 50.0 mL = 0.01 mol

concentration of HCl - 0.01 mol/0.1 L = 0.1 M

[HCl] = [H⁺] due to complete dissociation

pH = - log [H⁺]

pH = - log (0.1 M)

pH = 1

pH of the solution is 1