The correct answer is: C. Mol-1 let-2
The ionic product of water (Kw) is a measure of the ability of water to dissociate into hydrogen ions (H+) and hydroxide ions (OH-). It is defined as the product of the concentrations of these ions in solution, and is expressed in units of moles per liter squared (mol2/L2).
The concentration of hydrogen ions in pure water is equal to the concentration of hydroxide ions, and is equal to 10-7 moles per liter (mol/L). Therefore, the ionic product of water is equal to 10-14 mol2/L2.
Option A is incorrect because it has the wrong units. The units of the ionic product of water are mol2/L2, not mol2/L.
Option B is incorrect because it has the wrong exponent on the liter term. The units of the ionic product of water are mol2/L2, not mol2/L-2.
Option D is incorrect because it has the wrong exponent on the mole term. The units of the ionic product of water are mol2/L2, not mol-1/L2.