Please help! I am so stuck on how to do this, any help would be highly appreciated!

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Which of these conditions most likely produces an unstable isotope?

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5