Calculate the ph of a mixture made by adding 50.0 ml of 0.20 m hcl (aq) to 150.0 ml of water if the temperature of the mixture is 25.0 °c.

PH scale is used to determine how acidic or basic a solution is,

pH can be calculated once the [H⁺] is known.

Here HCl is a strong acid therefore it completely dissociates into H⁺ ions and Cl⁻ ions.

Therefore [HCl] = [H⁺]

number of HCl moles added - 0.20 mol/L x 0.050 L = 0.010 mol

The volume of the final solution = 50.0 + 150.0 = 200.0 mL

then the concentration of HCl = 0.010 mol / 0.200 mL = 0.05 mol/L

therefore [H⁺] = 0.05 M

then pH can be calculated using the following formula,

pH = - log[H⁺]

pH = - log (0.05 M)

pH = 1.30