Which of these statements best explains why pure water has a ph of 7?
1) pure water contains only h20 molecules, but ph is based on the concentration of h30+ ions.
2)each molecule of water can dissociate to form 7 h30+ ions.
3) water self-ionizes to form an equilibrium system that has [h30+]=1.0x10^-7m

Water self-ionizes to form an equilibrium system that has [h30+]=1.0*10^-7M

Your answer is C

A neutral solution would have a pH of 7, which means that the acid and base concentrations are equal. For the case of water, the concentrations of H3O+ and OH- are equal, which is 1.0 x 10^-7 M. Thus, the 3rd statement best explains the neutral pH of water.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Ibelieve the answer is d. titaniumhope my answer has you : )