What is the pH of a NaOH solution with a concentration of 4 x 10-4 M?

What was bohr’s contribution to the planetary model

The msds for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. it reacts with bases, various metals, and strong oxidizing agents. its vapors can form explosive mixtures with air.

How do you know when a chemical reaction has occurred