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

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

The diagram shows the relationship between scientific disciplines. the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a. physics b. biology c. chemistry d. metallurgy