Briefly describe how a potentiometric pH meter works

The boiling point of liquids is very high what does it indicate

It takes 155. kj/mol to break a fluorine-fluorine single bond. calculate the maximum wavelength of light for which a flouine-flouring single bond could be broken by absorbing a single photon

What is a three-dimensional structure that represents the alternating pattern of particles in a crystal? a polyatomic ion a crystal lattice an ionic bond a formula unit