Proton transport and conductivity between molecules of this compound occur via a chain of broken and reformed bonds in the Grotthuss mechanism. A Piper plot represents this substance by describing the major ions found in it. Oddly, the line of this substance's phase diagram at the solid/liquid boundary has a negative slope. The specific heat capacity of this substance at room temperature is around 4.2 joules per grams Kelvin. This substance has a bent geometry with two lone pairs. For 10 points, name this chemical substance, known as the universal solvent, with formula H2O.
a) Hydrogen peroxide
b) Ammonia
c) Water
d) Methanol