What is the pH of the final solution when 25 mL of 0.023 M HCl has been added to 35 mL of 0.040 M HCl at 25°C?
A)3.22
B)1.81
C)1.48
D)2.70
E)3.41

Question

Quizplus · Accepted Answer

To find the pH, first calculate the total moles of HCl in the solution. Moles from 25 mL of 0.023 M HCl is 0.000575 moles, and moles from 35 mL of 0.040 M HCl is 0.0014 moles. The total moles of HCl is 0.001975 moles. The total volume of the solution is 60 mL or 0.060 L. The concentration of HCl is 0.001975 moles / 0.060 L = 0.0329167 M. The pH is -log(0.0329167) ≈ 1.48.

What Is the PH of the Final Solution When 25