pH of an acetic acid NaOH solution?

Question

What is the pH of a solution containing 25 mL of 0.10M acetic acid after 10 mL of 0.10M NaOH is added? Yeah, this is for homework, but I have about 20 of them and would just like to see one solved. Thanks!

Answer 1

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[HC2H3O2]=(0.04M)(25 ml)/(40ml) - y = aprox. .025M

y(.025)/0.25=1.8 x 10^-5=y

[H3O+]=1.8 x10^-5 thus pH=4.75