Help with this question please!

Acetic Acid (CH₃COOH) is a weak acid. Ka= 1.8x 10^-5

1. Write a chemical equation for the dissociation of acetic acid?

CH₃COOH ---> CH₃COO^- + H⁺

2. Write the equilibrium (Ka) expression for the reaction?
Ka= [H⁺] [CH₃COO^-]
[CH₃COOH]

3. Vinegar is a solution of 1.5 M acetic acid. What is the pH of vinegar at this concentration?
I'm not sure, any suggestions?

These are my answers, are they correct? I really appreciate the help, I'm having a tough time with this problem

check out this interactive on weak acids

wow that was very helpful, so would that make the pH for question 3 equal to a pH of 1.5? since it's a weak acid