4. Find the pH after 24.90 mL of 0.100 M NaOH has been added to 25.00 mL of 0.100 M HCl.

What number of moles of OH- are added?

a) 0.100 M
b) 0.100 M x 0.02490 L = 0.002490 moles
c) 0.100 M x 25.00 mL = 2.500 moles
d) 0.100 M x 0.02500 L = 0.002500 moles