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A solution of 100mL HCl with the initial concentration of c(HCl) = 0.5 mol/L is treated with 10mL of NaOH with the concentration of c(NaOH)

A solution of 100mL HCl with the initial concentration of c(HCl) = 0.5 mol/L is treated with 10mL of NaOH with the concentration of c(NaOH) = 1 mol/L. Calculate the pH of HCl solution at the beginning and the pH of the resulting solution.

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