Calculate the CHANGE in PH for the following:?

Calculate the change in PH that occurs:



50 ml of water is added to 20 ml of a 0.50 mol/L solution of hydrochloric acid. Calculate the CHANGE in ph that occurs.



Please show the steps how to do this problem.Calculate the CHANGE in PH for the following:?
Water has pH = 7

Moles HCl = 0.020 x 0.50 / 1000 = 0.00001

Total volume = 70 mL = 0.070 L

Concentration H+ = 0.00001 / 0.070 = 0.000143

pH = 3.85

delta pH =3.15

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