The pH of the solution which was made by mixing 40ml of 0.100 M HCL with 25.00ml of 0.100 M KOH is 1.669.
The base and the acid have the same molarity, but the acid's volume is more than the bases' volume, hence after mixing the resultant solution is acidic.
The concentration of OH⁻ solution in the mixture is
= (molarity of base * volume of base - molarity of acid * volume of acid) / total volume
= (40 mL*0.1M - 25 mL *0.1 M ) / (40 mL +25mL)/ 1000)
= 0.021428571 M
pH = -log(0.021428571) = 1.669
Hence the pH is 1.669
To learn more about acidity, alkalinity, and bases,
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